Method and device for transmitting control information in a wireless communication system

ABSTRACT

The present invention relates to a wireless communication system. In more detail, in relation to a method for a terminal to transmit ACK/NACK in a wireless communication system, an ACK/NACK transmission method includes: receiving at least one Physical Downlink Shared Channel (PDSCH); transmitting at least one ACK/NACK corresponding to the at least one PDSCH through a plurality of Physical Uplink Control Channel (PUCCH) formats; and, when the at least one ACK/NACK is transmitted using a first PUCCH format, transmitting at least one ACK/NACK in an antenna port transmission mode set for a second PUCCH format.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of U.S. patent application Ser. No.13/824,281, filed on Mar. 15, 2013, now U.S. Pat. No. 9,155,083, whichis the National Stage filing under 35 U.S.C. 371 of InternationalApplication No. PCT/KR2011/007524, filed on Oct. 11, 2011, which claimsthe benefit of U.S. Provisional Application No. 61/392,390, filed onOct. 12, 2010, and 61/411,480, filed on Nov. 9, 2010, the contents ofwhich are all hereby incorporated by reference herein in their entirety.

TECHNICAL FIELD

The present invention relates to a wireless communication system, andmore particularly, to a method and apparatus for transmitting controlinformation. The wireless communication system may support CarrierAggregation (CA).

BACKGROUND ART

Wireless communication systems have been widely deployed to providevarious types of communication services such as voice or data services.Generally, a wireless communication system is a multiple access systemcapable of supporting communication with multiple users by sharingavailable system resources (bandwidth, transmit power, etc.). Multipleaccess systems include, for example, a Code Division Multiple Access(CDMA) system, a Frequency Division Multiple Access (FDMA) system, aTime Division Multiple Access (TDMA) system, an Orthogonal FrequencyDivision Multiple Access (OFDMA) system, and a Single Carrier FrequencyDivision Multiple Access (SC-FDMA) system.

DETAILED DESCRIPTION OF THE INVENTION Technical Problems

It is an object of the present invention to provide a method andapparatus for efficiently transmitting control information in a wirelesscommunication system. It is another object of the present invention toprovide a channel format and a signal processing method and apparatus,for efficiently transmitting control information. It is a further objectof the present invention to provide a method and apparatus forefficiently allocating resources for transmission of controlinformation.

It will be appreciated by persons skilled in the art that that thetechnical objects that can be achieved through the present invention arenot limited to what has been particularly described hereinabove andother technical objects of the present invention will be more clearlyunderstood from the following detailed description.

Technical Solutions

In accordance with an aspect of the present invention, a method fortransmitting, by a user equipment, an Acknowledgement/NegativeAcknowledgement (ACK/NACK) signal in a wireless communication systemincludes receiving at least one Physical Downlink Shared Channel (PDSCH)and transmitting at least one ACK/NACK signal corresponding to the atleast one PDSCH using one of a plurality of Physical Uplink ControlChannel (PUCCH) formats, wherein the at least one ACK/NACK signal istransmitted using an antenna port transmission mode configured for asecond PUCCH format when the at least one ACK/NACK signal is transmittedusing a first PUCCH format.

In accordance with another aspect of the present invention, a method fortransmitting, by a user equipment, an ACK/NACK signal in a wirelesscommunication system includes receiving at least one Physical DownlinkShared Channel (PDSCH) and transmitting at least one ACK/NACK signalcorresponding to the at least one PDSCH using one of a plurality ofPhysical Uplink Control Channel (PUCCH) formats, wherein the at leastone ACK/NACK signal is transmitted using a separately configured antennaport transmission mode other than an antenna port transmission modeconfigured for a first PUCCH format when the at least one ACK/NACKsignal is transmitted using the first PUCCH format.

In accordance with still another aspect of the present invention, anapparatus for transmitting an ACK/NACK signal in a wirelesscommunication system includes a Radio Frequency (RF) unit and aprocessor for controlling the RF unit to receive at least one PhysicalDownlink Shared Channel (PDSCH) and transmit at least one ACK/NACKsignal corresponding to the at least one PDSCH using one of a pluralityof Physical Uplink Control Channel (PUCCH) formats, wherein the at leastone ACK/NACK signal is transmitted using an antenna port transmissionmode configured for a second PUCCH format when the at least one ACK/NACKsignal is transmitted using a first PUCCH format.

In accordance with a further aspect of the present invention, anapparatus for transmitting an ACK/NACK signal in a wirelesscommunication system includes a Radio Frequency (RF) unit and aprocessor for controlling the RF unit to receive at least one PhysicalDownlink Shared Channel (PDSCH) and transmit at least one ACK/NACKsignal corresponding to the at least one PDSCH using one of a pluralityof Physical Uplink Control Channel (PUCCH) formats, wherein the at leastone ACK/NACK is transmitted using a separately configured antenna porttransmission mode other than an antenna port transmission modeconfigured for a first PUCCH format when the at least one ACK/NACKsignal is transmitted using the first PUCCH format.

The plurality of PUCCH formats may include a PUCCH format, a PUCCHformat 1a, a PUCCH format 1b, and a PUCCH format 3.

The antenna port transmission mode may be a single-antenna port mode ora Spatial Orthogonal Resource Transmit Diversity (SORTD) mode.

Advantageous Effects

According to the present invention, control information can beefficiently transmitted in a wireless communication system. Further, achannel format and a signal processing method for efficientlytransmitting resources can be provided. Moreover, resources fortransmission of control information can be efficiently allocated.

It will be appreciated by persons skilled in the art that that theeffects that can be achieved through the present invention are notlimited to what has been particularly described hereinabove and otheradvantages of the present invention will be more clearly understood fromthe following detailed description.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings, which are included as a part of the detaileddescription to provide a further understanding of the invention, provideembodiments of the invention and together with the description serve toexplain the principle of the invention. In the drawings,

FIG. 1 illustrates physical channels used in a 3GPP LTE system which isan exemplary wireless communication system and a general signaltransmission method using the physical channels;

FIG. 2 illustrates radio frame structures;

FIG. 3 illustrates an uplink signal processing operation;

FIG. 4 illustrates a downlink signal processing operation;

FIG. 5 illustrates SC-FDMA and OFDMA;

FIG. 6 illustrates signal mapping schemes in the frequency domain whilesatisfying a single carrier property;

FIG. 7 illustrates a signal processing operation for mapping DFTprocessed samples to a single carrier in clustered SC-FDMA;

FIGS. 8 and 9 illustrate signal processing operations for mapping DFTprocessed samples to multiple carriers in clustered SC-FDMA;

FIG. 10 illustrates a signal processing operation in segmented SC-FDMA;

FIG. 11 illustrates an uplink subframe structure.

FIG. 12 illustrates a signal processing procedure for transmitting an RSon uplink;

FIGS. 13 and 14 illustrate DMRS structures for a PUSCH;

FIGS. 15 and 16 illustrate slot level structures of PUCCH formats 1a and1b;

FIGS. 17 and 18 illustrate slot level structures of PUCCH formats2/2a/2b;

FIG. 19 illustrates ACK/NACK channelization for PUCCH Formats 1a and 1b;

FIG. 20 illustrates channelization for a hybrid structure of PUCCHFormat 1/1a/1b and PUCCH Format 2/2a/2b in the same PRB;

FIG. 21 illustrates PRB allocation for PUCCH transmission;

FIG. 22 illustrates a concept of downlink component carrier in a BS;

FIG. 23 illustrates a concept of uplink component carrier management ina UE;

FIG. 24 illustrates a concept of multi-carrier management of one MAC ina BS;

FIG. 25 illustrates multi-carrier management of one MAC in a UE;

FIG. 26 illustrates a concept of multi-carrier management of a pluralityof MACs in a BS;

FIG. 27 illustrates a concept of multi-carrier management of a pluralityof MACs in a UE;

FIG. 28 illustrates another concept of multi-carrier management of aplurality of MACs in a BS;

FIG. 29 illustrates another concept of multi-carrier management of aplurality of MACs in a UE;

FIG. 30 illustrates asymmetric carrier aggregation in which a pluralityof downlink component carriers is linked with one uplink carriercomponent;

FIGS. 31 to 36 illustrate PUCCH Format 3 structures and signalprocessing operations;

FIGS. 37 and 38 illustrate PUCCH Format 3 structures in which RSmultiplexing capacity is increased and signal processing operations;

FIG. 39 illustrates a signal processing block/procedure for SORTD;

FIG. 40 schematically explains an SORTD operation;

FIG. 41 is a flowchart illustrating an ACK/NACK transmission method towhich the present invention is applied; and

FIG. 42 illustrates a BS and a UE that are applicable to the presentinvention.

BEST MODE FOR CARRYING OUT THE INVENTION

Reference will now be made in detail to the exemplary embodiments of thepresent invention with reference to the accompanying drawings. Thedetailed description, which will be given below with reference to theaccompanying drawings, is intended to explain exemplary embodiments ofthe present invention, rather than to show the only embodiments that canbe implemented according to the invention. The following detaileddescription includes specific details in order to provide a thoroughunderstanding of the present invention. However, it will be apparent tothose skilled in the art that the present invention may be practicedwithout such specific details.

Techniques, devices, and systems described herein may be used in variouswireless multiple access systems. The wireless access system includes,for example, Code Division Multiple Access (CDMA), Frequency DivisionMultiple Access (FDMA), Time Division Multiple Access (TDMA), OrthogonalFrequency Division Multiple Access (OFDMA), Single Carrier-FrequencyDivision Multiple Access (SC-FDMA), and Multi-Carrier Frequency DivisionMultiple Access (MC-FDMA) systems. CDMA may be implemented as a radiotechnology such as Universal Terrestrial Radio Access (UTRA) orCDMA2000. TDMA may be implemented as a radio technology such as GlobalSystem for Mobile communication (GSM), General Packet Radio Service(GPRS), and Enhanced Data Rates for GSM Evolution (EDGE). OFDMA may beimplemented as a radio technology such as Institute of Electrical andElectronics Engineers (IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE802.20, and Evolved-UTRA (E-UTRA). UTRAN is a part of Universal MobileTelecommunication System (UMTS) and 3rd Generation Partnership Project(3GPP) Long Term Evolution (LTE) is a part of Evolved UMTS (E-UMTS)using E-UTRAN. 3GPP LTE employs OFDMA on downlink and SC-FDMA on uplink.LTE-A is an evolved version of 3GPP LTE. For convenience of description,it is assumed that the present invention is applied to 3GPP LTE/LTE-A.However, the technical features of the present invention are not limitedthereto.

In a wireless communication system, a User Equipment (UE) receivesinformation through downlink from a Base Station (BS) and transmitsinformation through uplink to the BS. Information transmitted andreceived by the BS and UE includes data and various control informationand there are various physical channels according to type/usage ofinformation transmitted and received by the BS and UE.

FIG. 1 illustrates physical channels used in a 3rd GenerationPartnership Project (3GPP) Long Term Evolution (LTE) system and ageneral signal transmission method using the physical channels.

Referring to FIG. 1, upon power-on or when a UE initially enters a cell,the UE performs an initial cell search involving synchronization of itstiming to a BS in step S101. For the initial cell search, the UE may besynchronized to the BS and acquire information such as a cell Identifier(ID) by receiving a Primary Synchronization CHannel (P-SCH) and aSecondary Synchronization CHannel (S-SCH). Then the UE may receivebroadcast information from the cell on a Physical Broadcast CHannel(PBCH). In the mean time, the UE may determine a downlink channel statusby receiving a DownLink Reference Signal (DL RS) during the initial cellsearch.

After the initial cell search, the UE may acquire more specific systeminformation by receiving a Physical Downlink Control CHannel (PDCCH) andreceiving a Physical Downlink Shared CHannel (PDSCH) based oninformation of the PDCCH in step S102.

Next, in order to complete access to the BS, the UE may perform a randomaccess procedure as indicated in steps S103 to S106. To this end, the UEmay transmit a preamble through a Physical Random Access CHannel (PRACH)(S103) and receive a response message to the preamble through the PDCCHand the PDSCH corresponding to the PDCCH (S104). If the random accessprocedure is contention-based, the UE may additionally perform acontention resolution procedure such as transmission of the PDSCH (S104)and reception of the PDCCH and the PDSCH corresponding to the PDCCH(S106).

The UE which has performed the above procedures may then receive aPDCCH/PDSCH (S107) and transmit a Physical Uplink Shared CHannel(PUSCH)/Physical Uplink Control CHannel (PUCCH) (S108), as a generaluplink/downlink (UL/DL) signal transmission procedure. Controlinformation that the UE transmits to the BS is collectively referred toas Uplink Control Information (UCI). UCI includes a Hybrid AutomaticRepeat and request (HARQ) Acknowledgement/Negative Acknowledgement(ACK/NACK) signal, a Scheduling Request (SR), a Channel QualityIndicator (CQI), a Precoding Matrix Index (PMI), a Rank Indicator (RI),and the like. In this specification, HARQ ACK/NACK is simply referred toas HARQ-ACK or ACK/NACK (A/N). HARQ-ACK includes at least one ofpositive ACK (simply, ACK), negative ACK (NACK), DTX, and NACK/DTX.While UCI is generally transmitted through the PUCCH, UCI may betransmitted through the PUSCH in the case where control information andtraffic data should be simultaneously transmitted. In addition, UCI maybe aperiodically transmitted through the PUSCH at the request/command ofa network.

FIG. 2 illustrates exemplary radio frame structures used in a wirelesscommunication system. In a cellular OFDM radio packet communicationsystem, uplink/downlink data packet transmission is performed insubframe units. One subframe is defined as a predetermined time intervalincluding a plurality of OFDM symbols. The 3GPP LTE standard supports atype 1 radio frame structure applicable to Frequency Division Duplex(FDD) and a type 2 radio frame structure applicable to Time DivisionDuplex (TDD).

FIG. 2(a) illustrates the structure of the type 1 radio frame. Adownlink radio frame includes 10 subframes, and one subframe includestwo slots in the time domain. A time required to transmit one subframeis defined as a Transmission Time Interval (TTI). For example, onesubframe may have a length of 1 ms and one slot may have a length of 0.5ms. One slot includes a plurality of OFDM symbols in the time domain andincludes a plurality of Resource Blocks (RBs) in the frequency domain.Since a 3GPP LTE system adopts OFDMA in downlink, an OFDM symbolindicates one symbol interval. The OFDM symbol may be referred to as anSC-FDMA symbol or a symbol interval. An RB as a resource allocation unitincludes a plurality of contiguous subcarriers in a slot.

The number of OFDM symbols included in one slot may be changed accordingto the configuration of a Cyclic Prefix (CP). The CP includes anextended CP and a normal CP. For example, if the OFDM symbols areconfigured by the normal CP, the number of OFDM symbols included in oneslot may be seven. If the OFDM symbols are configured by the extendedCP, since the length of one OFDM symbol is increased, the number of OFDMsymbols included in one slot is less than that of the case of the normalCP. In case of the extended CP, for example, the number of OFDM symbolsincluded in one slot may be six. If a channel state is unstable, forexample, if a UE moves at a high speed, the extended CP may be used inorder to further reduce inter-symbol interference.

In case of using the normal CP, since one slot includes 7 OFDM symbols,one subframe includes 14 OFDM symbols. At this time, a maximum of thefirst three OFDM symbols of each subframe may be allocated to a PDCCHand the remaining OFDM symbols may be allocated to a PDSCH.

FIG. 2(b) illustrates the structure of the type 2 radio frame. The type2 radio frame includes two half frames, each of which includes fivesubframes, a Downlink Pilot Time Slot (DwPTS), a Guard Period (GP), andan Uplink Pilot Time Slot (UpPTS). One subframe includes two slots.DwPTS is used for initial cell search, synchronization, or channelestimation in a UE. UpPTS is used for channel estimation in a BS anduplink transmission synchronization of the UE. GP is located betweenuplink and downlink to remove interference generated in uplink due tomulti-path delay of a downlink signal.

The structure of the radio frame is only exemplary. Accordingly, thenumber of subframes included in the radio frame, the number of slotsincluded in the subframe, or the number of symbols included in the slotmay be changed in various manners.

FIG. 3 illustrates a signal processing operation for transmitting anuplink signal in a UE.

A scrambling module 201 may scramble a transmission signal using ascrambling signal in order to transmit an uplink signal. A modulationmapper 202 modulates the scrambled signal received from the scramblingmodule 201 to complex modulation symbols using Binary Phase Shift Keying(BPSK), Quadrature Phase Shift Keying (QPSK), or 16 Quadrature AmplitudeModulation (QAM)/64 QAM according to the type of the transmission signalor a channel state. A precoder 203 processes the complex modulationsymbols received from the modulation mapper 202. An RE mapper 204 maymap the complex modulation symbols received from the precoder 203 totime-frequency REs. After being processed in an SC-FDMA signal generator205, the mapped signal may be transmitted to a BS through an antenna.

FIG. 4 illustrates a signal processing operation for transmitting adownlink signal in a BS.

In an LTE system, the BS may transmit one or more codewords on downlink.Scrambling modules 301 and modulation mappers 302 may process thecodewords into complex symbols, as in FIG. 3. A layer mapper 303 mapsthe complex symbols to a plurality of layers. A precoding module 304 maymultiply the layers by a precoding matrix and may allocate themultiplied signals to respective transmission antennas. RE mappers 305map the antenna-specific signals processed by the precoding module 304to time-frequency REs. After being processed in OFDMA signal generators306, the mapped signals may be transmitted through the respectiveantennas.

In the wireless communication system, uplink signal transmission from aUE is more problematic than downlink signal transmission from a BS inPeak-to-Average Power Ratio (PAPR). Accordingly, SC-FDMA is adopted foruplink signal transmission, unlike OFDMA used for downlink signaltransmission as described above with reference to FIGS. 3 and 4.

FIG. 5 illustrates SC-FDMA and OFDMA, to which the present invention isapplied. The 3GPP system uses OFDMA on downlink and SC-FDMA on uplink.

Referring to FIG. 5, a UE for uplink signal transmission and a BS fordownlink signal transmission commonly have a serial-to-parallelconverter 401, a subcarrier mapper 403, an M-point Inverse DiscreteFourier Transform (IDFT) module 404, and a Cyclic Prefix (CP) additionmodule 406. Nonetheless, the UE further includes an N-point DiscreteFourier Transform (DFT) module 402 to transmit an uplink signal inSC-FDMA. The N-point DFT module 402 partially offsets the effects ofIDFT performed by the M-point IDFT module 404 so that a transmissionuplink signal may have a single carrier property.

FIG. 6 illustrates examples of mapping input symbols to subcarriers inthe frequency domain while satisfying the single carrier property. FIG.6(a) illustrates localized mapping and FIG. 6(b) illustrates distributedmapping.

Clustered SC-FDMA which is a modified version of SC-FDMA will now bedescribed. In clustered SC-FDMA, DFT processed output samples aredivided into sub-groups and the sub-groups are discontinuously mapped inthe frequency domain (or subcarrier domain), during a subcarrier mappingprocess.

FIG. 7 illustrates an operation for mapping DFT processed samples to asingle carrier in clustered SC-FDMA. FIGS. 8 and 9 illustrate operationsfor mapping DFT processed samples to multiple carriers in clusteredSC-FDMA. FIG. 7 illustrates the application of intra-carrier clusteredSC-FDMA, whereas FIGS. 8 and 9 illustrate the application ofinter-carrier clustered SC-FDMA. FIG. 8 illustrates signal generationthrough a single IFFT block in the case of alignment of a subcarrierspacing between contiguous subcarriers in a situation in which ComponentCarriers (CCs) are contiguously allocated in the frequency domain. FIG.9 illustrates signal generation through a plurality of IFFT blocks in asituation in which CCs are non-contiguously allocated in the frequencydomain.

FIG. 10 illustrates a signal processing operation in segmented SC-FDMA.

As the number of DFT blocks is equal to the number of IFFT blocks andthus the DFT blocks and the IFFT blocks are in a one-to-onecorrespondence, segmented SC-FDMA is a simple extension of the DFTspreading and IFFT subcarrier mapping structure of conventional SC-FDMAand may be expressed as NxSC-FDMA or NxDFT-s-OFDMA. In this disclosure,segmented SC-FDMA includes all these terms. Referring to FIG. 9, insegmented SC-FDMA, all modulation symbols in the time domain are dividedinto N groups (where N is an integer greater than 1) and subjected to aDFT process in units of a group in order to relieve single carrierproperty constraints.

FIG. 11 illustrates an uplink subframe structure.

Referring to FIG. 11, an uplink subframe includes multiple (e.g. two)slots. A slot may include a different number of SC-FDMA symbolsaccording to the length of a CP. For example, in case of a normal CP, aslot may include 7 SC-FDMA symbols. The uplink subframe is divided intoa data region and a control region. The data region includes a PUSCHregion and is used to transmit data signals such as voice signals. Thecontrol region includes a PUCCH region and is used to transmit controlinformation. The PUCCH includes an RB pair (e.g. RB pair of a frequencymirrored location, m=0, 1, 2, 3) located at both ends of the data regionon the frequency domain and the RB pair is hopped on a slot basis. UCIincludes an HARQ ACK/NACK, a CQI, a PMI, and an RI.

FIG. 12 illustrates a signal processing procedure for transmitting an RSon uplink. While data is converted into a frequency-domain signalthrough a DFT processor, is mapped to a signal on subcarriers, and thenis transmitted through IFFT, an RS is generated without passing throughthe DFT precoder. Specifically, an RS sequence is directly generated(S11) in the frequency domain and then the RS is transmitted throughsequential processes of localized mapping (S12), IFFT (S13), and CPinsertion (S14).

RS sequence r_(u,v) ^((a))(n) is defined by a cyclic shift a of a basesequence r _(u,v)(n), and may be expressed as Equation 1.r _(u,v) ^((a)))(n)=e ^(jαn) r _(u,v)(n),0≦n<M _(sc) ^(RS)   [Equation1]

Here, M_(sc) ^(RS)=mN_(sc) ^(RB) is the length of the reference signalsequence, N_(sc) ^(RB) is Resource block size, expressed as a number ofsubcarriers, and 1≦m≦N_(RB) ^(max,UL). N_(RB) ^(max,UL) is maximumuplink bandwidth.

Base sequences r _(u,v)(n) are divided into groups, where uε{0, 1, . . ., 29} is the group number and v is the base sequence number within thegroup, such that each group contains one base sequence (v=0) of eachlength M_(sc) ^(RS)=mN_(sc) ^(RB), 1≦m≦5 and two base sequences (v=0, 1)of each length M_(sc) ^(RS)=mN_(sc) ^(RB), 6≦m≦N_(RB) ^(max,UL). Thesequence group number u and the number v within the group may vary intime as described in Sections 5.5.1.3 and 5.5.1.4, respectively. Thedefinition of the base sequence r _(u,v)(0), . . . , r _(u,v)(M_(sc)^(RS)−1) depends on the sequence length M_(sc) ^(RS).

Base sequences of length 3N_(sc) ^(RB) or larger may be defined asfollows.

For M_(sc) ^(RS)≧3N_(sc) ^(RB), the base sequence r _(u,v)(0), . . . , r^(u,v)(M_(sc) ^(RS)−1) is given by Equation 2.r _(u,v)(n)=x _(q)(n mod N _(ZC) ^(RS)),0≦n<M _(sc) ^(RS)   [Equation 2]

The q^(th) root Zadoff-Chu sequence may be defined by Equation 3.

$\begin{matrix}{{{x_{q}(m)} = {\mathbb{e}}^{{- j}\frac{\pi\;{{qm}{({m + 1})}}}{N_{ZC}^{RS}}}},{0 \leq m \leq {N_{ZC}^{RS} - 1}}} & \left\lbrack {{Equation}\mspace{14mu} 3} \right\rbrack\end{matrix}$

where q satisfies the following Equation 4.q=└q+½┘+v·(−1)^(└2q┘)q=N _(ZC) ^(RS)·(u+1)/31   [Equation 4]

The length N_(ZC) ^(RS) of the Zadoff-Chu sequence is given by thelargest prime number such that N_(ZC) ^(RS)≦M_(sc) ^(RS).

Base sequences of length less than 3N_(sc) ^(RB) may be defined asfollows.

For M_(sc) ^(RS)=N_(sc) ^(RB) and M_(sc) ^(RS)=2N_(sc) ^(RB), basesequence is given by Equation 5.r _(u,v)(n)=e ^(jφ(n)π/4),0≦n≦M _(sc) ^(RS)−1   [Equation 5]

where the value of φ(n) is given by the following Table 1 and Table 2for M_(sc) ^(RS)=N_(sc) ^(RB) and M_(sc) ^(RS)=2N_(sc) ^(RB),respectively.

TABLE 1 u φ(0), . . . , φ(11) 0 −1 1 3 −3 3 3 1 1 3 1 −3 3 1 1 1 3 3 3−1 1 −3 −3 1 −3 3 2 1 1 −3 −3 −3 −1 −3 −3 1 −3 1 −1 3 −1 1 1 1 1 −1 −3−3 1 −3 3 −1 4 −1 3 1 −1 1 −1 −3 −1 1 −1 1 3 5 1 −3 3 −1 −1 1 1 −1 −1 3−3 1 6 −1 3 −3 −3 −3 3 1 −1 3 3 −3 1 7 −3 −1 −1 −1 1 −3 3 −1 1 −3 3 1 81 −3 3 1 −1 −1 −1 1 1 3 −1 1 9 1 −3 −1 3 3 −1 −3 1 1 1 1 1 10 −1 3 −1 11 −3 −3 −1 −3 −3 3 −1 11 3 1 −1 −1 3 3 −3 1 3 1 3 3 12 1 −3 1 1 −3 1 1 1−3 −3 −3 1 13 3 3 −3 3 −3 1 1 3 −1 −3 3 3 14 −3 1 −1 −3 −1 3 1 3 3 3 −11 15 3 −1 1 −3 −1 −1 1 1 3 1 −1 −3 16 1 3 1 −1 1 3 3 3 −1 −1 3 −1 17 −31 1 3 −3 3 −3 −3 3 1 3 −1 18 −3 3 1 1 −3 1 −3 −3 −1 −1 1 −3 19 −1 3 1 31 −1 −1 3 −3 −1 −3 −1 20 −1 −3 1 1 1 1 3 1 −1 1 −3 −1 21 −1 3 −1 1 −3 −3−3 −3 −3 1 −1 −3 22 1 1 −3 −3 −3 −3 −1 3 −3 1 −3 3 23 1 1 −1 −3 −1 −3 1−1 1 3 −1 1 24 1 1 3 1 3 3 −1 1 −1 −3 −3 1 25 1 −3 3 3 1 3 3 1 −3 −1 −13 26 1 3 −3 −3 3 −3 1 −1 −1 3 −1 −3 27 −3 −1 −3 −1 −3 3 1 −1 1 3 −3 −328 −1 3 −3 3 −1 3 3 −3 3 3 −1 −1 29 3 −3 −3 −1 −1 −3 −1 3 −3 3 1 −1

TABLE 2 u φ(0), . . . , φ(23) 0 −1 3 1 −3 3 −1 1 3 −3 3 1 3 −3 3 1 1 −11 3 −3 3 −3 −1 −3 1 −3 3 −3 −3 −3 1 −3 −3 3 −1 1 1 1 3 1 −1 3 −3 −3 1 31 1 −3 2 3 −1 3 3 1 1 −3 3 3 3 3 1 −1 3 −1 1 1 −1 −3 −1 −1 1 3 3 3 −1 −31 1 3 −3 1 1 −3 −1 −1 1 3 1 3 1 −1 3 1 1 −3 −1 −3 −1 4 −1 −1 −1 −3 −3 −11 1 3 3 −1 3 −1 1 −1 −3 1 −1 −3 −3 1 −3 −1 −1 5 −3 1 1 3 −1 1 3 1 −3 1−3 1 1 −1 −1 3 −1 −3 3 −3 −3 −3 1 1 6 1 1 −1 −1 3 −3 −3 3 −3 1 −1 −1 1−1 1 1 −1 −3 −1 1 −1 3 −1 −3 7 −3 3 3 −1 −1 −3 −1 3 1 3 1 3 1 1 −1 3 1−1 1 3 −3 −1 −1 1 8 −3 1 3 −3 1 −1 −3 3 −3 3 −1 −1 −1 −1 1 −3 −3 −3 1 −3−3 −3 1 −3 9 1 1 −3 3 3 −1 −3 −1 3 −3 3 3 3 −1 1 1 −3 1 −1 1 1 −3 1 1 10−1 1 −3 −3 3 −1 3 −1 −1 −3 −3 −3 −1 −3 −3 1 −1 1 3 3 −1 1 −1 3 11 1 3 3−3 −3 1 3 1 −1 −3 −3 −3 3 3 −3 3 3 −1 −3 3 −1 1 −3 1 12 1 3 3 1 1 1 −1−1 1 −3 3 −1 1 1 −3 3 3 −1 −3 3 −3 −1 −3 −1 13 3 −1 −1 −1 −1 −3 −1 3 3 1−1 1 3 3 3 −1 1 1 −3 1 3 −1 −3 3 14 −3 −3 3 1 3 1 −3 3 1 3 1 1 3 3 −1 −1−3 1 −3 −1 3 1 1 3 15 −1 −1 1 −3 1 3 −3 1 −1 −3 −1 3 1 3 1 −1 −3 −3 −1−1 −3 −3 −3 −1 16 −1 −3 3 −1 −1 −1 −1 1 1 −3 3 1 3 3 1 −1 1 −3 1 −3 1 1−3 −1 17 1 3 −1 3 3 −1 −3 1 −1 −3 3 3 3 −1 1 1 3 −1 −3 −1 3 −1 −1 −1 181 1 1 1 1 −1 3 −1 −3 1 1 3 −3 1 −3 −1 1 1 −3 −3 3 1 1 −3 19 1 3 3 1 −1−3 3 −1 3 3 3 −3 1 −1 1 −1 −3 −1 1 3 −1 3 −3 −3 20 −1 −3 3 −3 −3 −3 −1−1 −3 −1 −3 3 1 3 −3 −1 3 −1 1 −1 3 −3 1 −1 21 −3 −3 1 1 −1 1 −1 1 −1 31 −3 −1 1 −1 1 −1 −1 3 3 −3 −1 1 −3 22 −3 −1 −3 3 1 −1 −3 −1 −3 −3 3 −33 −3 −1 1 3 1 −3 1 3 3 −1 −3 23 −1 −1 −1 −1 3 3 3 1 3 3 −3 1 3 −1 3 −1 33 −3 3 1 −1 3 3 24 1 −1 3 3 −1 −3 3 −3 −1 −1 3 −1 3 −1 −1 1 1 1 1 −1 −1−3 −1 3 25 1 −1 1 −1 3 −1 3 1 1 −1 −1 −3 1 1 −3 1 3 −3 1 1 −3 −3 −1 −126 −3 −1 1 3 1 1 −3 −1 −1 −3 3 −3 3 1 −3 3 −3 1 −1 1 −3 1 1 1 27 −1 −3 33 1 1 3 −1 −3 −1 −1 −1 3 1 −3 −3 −1 3 −3 −1 −3 −1 −3 −1 28 −1 −3 −1 −1 1−3 −1 −1 1 −1 −3 1 1 −3 1 −3 −3 3 1 1 −1 3 −1 −1 29 1 1 −1 −1 −3 −1 3 −13 −1 1 3 1 −1 3 1 3 −3 −3 1 −1 −1 1 3

In the meantime, RS hopping is described as follows.

The sequence-group number u in slot n_(s) may be defined by a grouphopping pattern f_(gh)(n_(s))) and a sequence-shift pattern f_(ss)according to the following Equation 6.u=(f _(gh)(n _(s))+f _(ss)) mod 30   [Equation 6]

where mod denotes the modulo operation.

There are 17 different hopping patterns and 30 different sequence-shiftpatterns. Sequence-group hopping can be enabled or disabled by means ofthe cell-specific parameter provided by higher layers.

PUCCH and PUSCH have the same hopping pattern but may have differentsequence-shift patterns.

The group-hopping pattern f_(gh) (n_(s))) is the same for PUSCH andPUCCH and given by the following Equation 7.

$\begin{matrix}{{f_{gh}\left( n_{s} \right)} = \left\{ \begin{matrix}0 & {{if}\mspace{14mu}{group}\mspace{14mu}{hopping}\mspace{14mu}{is}\mspace{14mu}{disabled}} \\{\left( {\sum\limits_{i = 0}^{7}\;{{c\left( {{8n_{s}} + i} \right)} \cdot 2^{i}}} \right){mod}{\;\;}30} & {{if}\mspace{14mu}{group}\mspace{14mu}{hopping}\mspace{14mu}{is}\mspace{14mu}{enabled}}\end{matrix} \right.} & \left\lbrack {{Equation}\mspace{14mu} 7} \right\rbrack\end{matrix}$

where c(i) is the pseudo-random sequence. The pseudo-random sequencegenerator may be initialized with

$c_{init} = \left\lfloor \frac{N_{ID}^{cell}}{30} \right\rfloor$at the beginning of each radio frame.

The sequence-shift pattern f_(ss) definition differs between PUCCH andPUSCH.

For PUCCH, the sequence-shift pattern f_(ss) ^(PSUCCH) is given byf_(ss) ^(PUCCH)=N_(ID) ^(cell) mod 30.

For PUSCH, the sequence-shift pattern f_(ss) ^(PUSCH) is given by f_(ss)^(PUSCH)=(f_(ss) ^(PUCCH)+Δ_(ss)) mod 30 where Δ_(ss)ε{0, 1, . . . 29}is configured by higher layers. Hereinafter, sequence hopping isdescribed.

Sequence hopping only applies for reference-signals of length M_(sc)^(RS)≧6N_(sc) ^(RB).

For reference-signals of length M_(sc) ^(RS)≧6N_(sc) ^(RB), the basesequence number v within the base sequence group is given by v=0.

For reference-signals of length M_(sc) ^(RS)≧6N_(sc) ^(RB), the basesequence number v within the base sequence group in slot n_(s) is givenby the following Equation 8.

$\begin{matrix}{v = \left\{ \begin{matrix}{c\left( n_{s} \right)} & {{if}\mspace{14mu}{group}\mspace{14mu}{hopping}\mspace{14mu}{is}\mspace{14mu}{disabled}\mspace{14mu}{and}\mspace{14mu}{sequence}\mspace{14mu}{hopping}\mspace{14mu}{is}\mspace{14mu}{enabled}} \\0 & {otherwise}\end{matrix} \right.} & \left\lbrack {{Equation}\mspace{14mu} 8} \right\rbrack\end{matrix}$

where c(i) is the pseudo-random sequence, and the parameter provided byhigher layers determines if sequence hopping is enabled or not. Thepseudo-random sequence generator may be initialized with

$c_{init} = {{\left\lfloor \frac{N_{ID}^{cell}}{30} \right\rfloor \cdot 2^{5}} + f_{ss}^{PUSCH}}$at the beginning of each radio frame.

The demodulation reference signal sequence r_(PUSCH)(·) for PUSCH isdefined by r_(PUSCH)(m·M_(sc) ^(RS)+n)=(m)r_(u,v) ^((a))(n), where m=0,1, n=0, . . . , M_(sc) ^(RS)−1, and M_(sc) ^(RS)=M_(sc) ^(PUSCH).

The cyclic shift in a slot is given as α=2πn_(cs)/12 withn_(cs)=(n_(DMRS) ⁽¹⁾+n_(DMR) ⁽²⁾+n_(PRS)(n_(s))) mod 12. n_(DMRS) ⁽¹⁾ isa value broadcasted, n_(DMRS) ⁽²⁾ is given by uplink schedulingassignment, n_(PRS)(n_(s)) is a cell-specific cyclic shift value.n_(PRS)(n_(s))) varies depending on a slot number n_(s) and given byn_(PRS)(n_(s))=Σ_(i=0) ⁷c(8·n_(s)+i)·2^(i).

c(i) is the pseudo-random sequence and cell-specific. The pseudo-randomsequence generator may be initialized with

$c_{init} = {{\left\lfloor \frac{N_{ID}^{cell}}{30} \right\rfloor \cdot 2^{5}} + f_{ss}^{PUSCH}}$at the beginning of each radio frame.

Table 3 shows Cyclic Shift Field in downlink control information (DCI)format 0 and n_(DMRS) ⁽²⁾.

TABLE 3 Cyclic Shift Field in DCI format 0 n_(DMRS) ⁽²⁾ 000 0 001 2 0103 011 4 100 6 101 8 110 9 111 10

Uplink RS for PUSCH is mapped according to the following method.

The sequence is multiplied with the amplitude scaling factor β_(PUSCH)and mapped in sequence starting with r_(PUSCH) (0 to the set of physicalresource blocks (PRBs) that is identical to that used for acorresponding PUSCH. The mapping to resource elements (k,l) with l=3 fornormal cyclic prefix and l=2 for extended cyclic prefix, in the subframeis in increasing order of first k, then the slot number.

In summary, if length is 3N_(sc) ^(RB) or more, a ZC sequence is usedwith cyclic extension and, if length is less than 3N_(sc) ^(RB), acomputer generated sequence is used. A cyclic shift is determinedaccording to cell-specific cyclic shift, UE-specific cyclic shift, andhopping pattern.

FIG. 13 shows a DeModulation Reference Signal (DMRS) structure for aPUSCH in case of a normal CP and FIG. 14 shows a DMRS structure for aPUSCH in case of an extended CP. A DMRS is transmitted through thefourth and eleventh SC-FDMA symbols in FIG. 13 and transmitted throughthe third and ninth SC-FDMA symbols in FIG. 14.

FIGS. 15 to 18 illustrate slot level structures of PUCCH formats. APUCCH has the following formats in order to transmit controlinformation.

-   -   (1) PUCCH Format 1: used for On-Off Keying (OOK) modulation and        a Scheduling Request (SR).    -   (2) PUCCH Formats 1a and 1b: used for transmitting ACK/NACK        information.        -   1) PUCCH Format 1a: ACK/NACK information modulated by BPSK            for one codeword.        -   2) PUCCH Format 1b: ACK/NACK information modulated by QPSK            for two codewords.    -   (3) PUCCH Format 2: modulated by QPSK and used for Channel        Quality Indicator (CQI) transmission.    -   (4) PUCCH Formats 2a and 2b: used for simultaneous transmission        of a CQI and ACK/NACK information.

Table 4 lists modulation schemes and numbers of bits per subframe forPUCCH formats and Table 5 lists numbers of Reference Signals (RSs) perslot for PUCCH formats. Table 6 lists SC-FDMA symbol positions of RSsfor PUCCH formats. In Table 4, PUCCH Formats 2a and 2 b correspond tothe case of a normal CP.

TABLE 4 Number of Bits per PUCCH Format Modulation Subframe, M_(bit) 1 N/A N/A 1a BPSK 1 1b QPSK 2 2  QPSK 20 2a QPSK + BPSK 21 2b QPSK + BPSK22

TABLE 5 PUCCH Format Normal CP Extended CP 1, 1a, 1b 3 2 2 2 1 2a, 2b 2N/A

TABLE 6 SC-FDMA Symbol Position of RS PUCCH Format Normal CP Extended CP1, 1a, 1b 2, 3, 4 2, 3 2, 2a, 2b 1, 5 3

FIG. 15 illustrates PUCCH Formats 1a and 1b in case of normal cyclicprefix, and FIG. 16 illustrates PUCCH Formats 1a and 1b in case ofextended cyclic prefix. The same UCI is repeated on a slot basis in asubframe in PUCCH Format 1a and 1b. A UE transmits ACK/NACK signalsthrough different resources of different Cyclic Shifts (CSs) (afrequency-domain code) of a Computer-Generated Constant Amplitude ZeroAuto Con-elation (CG-CAZAC) sequence and an Orthogonal Cover (OC) orOrthogonal Cover Code (OCC) (a time-domain spreading code). The OCincludes, for example, a Walsh/DFT orthogonal code. If the number of CSsis 6 and the number of OCs is 3, a total of 18 UEs may be multiplexed inthe same Physical Resource Block (PRB) based on a single antenna. An OCsequence w0, w1, w2 and w3 is applicable to a time domain (after FFTmodulation) or to a frequency domain (before FFT modulation). PUCCHFormat 1 for transmitting SR information is the same as PUCCH Formats 1aand 1b in slot-level structure and different from PUCCH Formats 1a and1b in modulation scheme.

ACK/NACK resources comprised of a CS, an OC, and a PRB may be allocatedto a UE by Radio Resource Control (RRC) signaling, for SR andSemi-Persistent Scheduling (SPS). ACK/NACK resources may be implicitlyallocated to a UE using the lowest CCE index of a PDCCH corresponding toa PDSCH, for dynamic ACK/NACK or non-persistent scheduling.

FIG. 17 illustrates PUCCH Format 2/2a/2b in case of a normal CP and FIG.18 illustrates PUCCH Format 2/2a/2b in case of an extended CP. Referringto FIGS. 17 and 18, one subframe includes 10 QPSK symbols except for anRS symbol in case of a normal CP. Each QPSK symbol is spread with a CSin the frequency domain and then mapped to a corresponding SC-FDMAsymbol. SC-FDMA symbol-level CS hopping may be applied to randomizeinter-cell interference. An RS may be multiplexed by Code DivisionMultiplexing (CDM) using a CS. For example, if the number of availableCSs is 12 or 6, 12 or 6 UEs may be multiplexed in the same PRB. That is,a plurality of UEs may be multiplexed using CS+OC+PRB and CS+PRB inPUCCH Formats 1/1a/1b and 2/2a/2b, respectively.

Length-4 and length-3 OCs for PUCCH Format 1/1a/1b are illustrated inTable 7 and Table 8 below.

TABLE 7 Length-4 orthogonal sequences for PUCCH formats 1/1a/1b Sequenceindex Orthogonal sequences n_(oc) (n_(s)) [w(0) . . . w(N_(SF) ^(PUCCH)− 1)] 0 [+1 +1 +1 +1] 1 [+1 −1 +1 −1] 2 [+1 −1 −1 +1]

TABLE 8 Length-3 orthogonal sequences for PUCCH formats 1/1a/1b Sequenceindex Orthogonal sequences n_(oc) (n_(s)) [w(0) . . . w(N_(SF) ^(PUCCH)− 1)] 0 [1 1 1] 1 [1 e^(j2π/3) e^(j4π/3)] 2 [1 e^(j4π/3) e^(j2π/3)]

OCs for RSs in PUCCH Format 1/1a/1b are given in Table 9 below.

TABLE 9 1a and 1b Sequence index Normal Extended n_(oc) (n_(s)) cyclicprefix cyclic prefix 0 [1 1 1] [1 1] 1 [1 e^(j2π/3) e^(j4π/3)] [1 −1] 2[1 e^(j4π/3) e^(j2π/3)] N/A

FIG. 19 illustrates ACK/NACK channelization for PUCCH Formats 1a and 1b.In FIG. 19, Δ_(shift) ^(PUCCH)=2.

FIG. 20 illustrates channelization for a hybrid structure of PUCCHFormat 1/1a/1b and PUCCH Format 2/2a/2b in the same PRB.

CS hopping and OC re-mapping may be applied as follows.

-   -   (1) Symbol-based cell-specific CS hopping for randomization of        inter-cell interference    -   (2) Slot-level CS/OC re-mapping    -   1) For randomization of inter-cell interference    -   2) Slot-based approach for mapping between an ACK/NACK channel        and a resources

Meanwhile, a resource n_(r) for PUCCH Format 1/1a/1b includes thefollowing combinations.

-   -   (1) CS (identical to DFT OC in symbol level) (n_(cs))    -   (2) OC (OC in slot level) (n_(oc))    -   (3) Frequency RB (n_(rb))

Assuming that indexes of a CS, an OC, and an RB are denoted by n_(cs),n_(oc), and n_(rb), respectively, a representative index n_(r) includesn_(cs), n_(oc), and n_(rb) where n_(r) satisfies n_(r)=(n_(cs), n_(oc),n_(rb)).

A combination of an ACK/NACK and a CQI, PMI and RI, and a combination ofan ACK/NACK and a CQI may be delivered through PUCCH Format 2/2a/2b.Reed Muller (RM) channel coding may be applied.

For example, channel coding for an uplink CQI in the LTE system isdescribed as follows. A bit stream a₀, a₁, a₂, a₃, . . . , a_(A-1) ischannel coded using a (20, A) RM code. Table 10 lists base sequences forthe (20, A) code. a₀ and a_(A-1) denote the Most Significant Bit (MSB)and Least Significant Bit (LSB), respectively. In case of an extendedCP, up to 11 bits can be transmitted except for simultaneoustransmission of a CQI and an ACK/NACK. A bit stream may be encoded to 20bits using an RM code and then modulated by QPSK. Before QPSKmodulation, the coded bits may be scrambled.

TABLE 10 i M_(i,0) M_(i,1) M_(i,2) M_(i,3) M_(i,4) M_(i,5) M_(i,6)M_(i,7) M_(i,8) M_(i,9) M_(i,10) M_(i,11) M_(i,12) 0 1 1 0 0 0 0 0 0 0 01 1 0 1 1 1 1 0 0 0 0 0 0 1 1 1 0 2 1 0 0 1 0 0 1 0 1 1 1 1 1 3 1 0 1 10 0 0 0 1 0 1 1 1 4 1 1 1 1 0 0 0 1 0 0 1 1 1 5 1 1 0 0 1 0 1 1 1 0 1 11 6 1 0 1 0 1 0 1 0 1 1 1 1 1 7 1 0 0 1 1 0 0 1 1 0 1 1 1 8 1 1 0 1 1 00 1 0 1 1 1 1 9 1 0 1 1 1 0 1 0 0 1 1 1 1 10 1 0 1 0 0 1 1 1 0 1 1 1 111 1 1 1 0 0 1 1 0 1 0 1 1 1 12 1 0 0 1 0 1 0 1 1 1 1 1 1 13 1 1 0 1 0 10 1 0 1 1 1 1 14 1 0 0 0 1 1 0 1 0 0 1 0 1 15 1 1 0 0 1 1 1 1 0 1 1 0 116 1 1 1 0 1 1 1 0 0 1 0 1 1 17 1 0 0 1 1 1 0 0 1 0 0 1 1 18 1 1 0 1 1 11 1 0 0 0 0 0 19 1 0 0 0 0 1 1 0 0 0 0 0 0

Channel-coded bits b₀, b₁, b₂, b₃, . . . , b_(B-1) may be generated byEquation 9.

$\begin{matrix}{b_{i} = {\sum\limits_{n = 0}^{A - 1}\;{\left( {o_{n} \cdot M_{i,n}} \right){mod}\mspace{11mu} 2}}} & \left\lbrack {{Equation}\mspace{14mu} 9} \right\rbrack\end{matrix}$

where i=0, 1, 2, . . . , B−1.

Table 11 illustrates a UCI field for feedback of a wideband report (asingle antenna port, transmit diversity, or open loop spatialmultiplexing PDSCH) CQI.

TABLE 11 Field Bandwidth Wideband CQI 4

Table 12 illustrates a UCI field for feedback of a wideband CQI and aPMI. This field reports transmission of a closed loop spatialmultiplexing PDSCH.

TABLE 12 Bandwidth 2 antenna ports 4 antenna ports Field Rank = 1 Rank =2 Rank = 1 Rank > 1 wideband CQI 4 4 4 4 Spatial 0 3 0 3 differentialCQI PMI 2 1 4 4

Table 13 illustrates a UCI field for RI feedback for a wideband report.

TABLE 13 Bit widths 4 antenna ports Field 2 antenna ports Up to 2 layersUp to 4 layers RI 1 1 2

FIG. 21 illustrates PRB allocation. Referring to FIG. 21, a PRB may beused to carry a PUCCH in slot n_(s).

A multi-carrier system or Carrier Aggregation (CA) system is a systemusing a plurality of carriers each having a narrower bandwidth than atarget bandwidth in order to support a broadband. When a plurality ofcarriers each having a narrower bandwidth than a target bandwidth isaggregated, the bandwidth of the aggregated carriers may be limited to abandwidth used in a legacy system in order to ensure backwardcompatibility with the legacy system. For example, the legacy LTE systemsupports bandwidths of 1.4, 3, 5, 10, 15, and 20 MHz and an LTE-A systemevolved from an LTE system may support a broader bandwidth than 20 MHzusing only the bandwidths supported by the LTE system. Alternatively, CAmay be supported by defining a new bandwidth irrespective of thebandwidths used in the legacy system. The term multi-carrier isinterchangeably used with CA and bandwidth aggregation. In addition, CAincludes both contiguous CA and non-contiguous CA.

FIG. 22 illustrates a concept of downlink (DL) CC management in a BS andFIG. 23 illustrates a concept of uplink (UL) CC management in a UE. Forconvenience of description, a higher layer will be simply referred to asa MAC in FIGS. 22 and 23.

FIG. 24 illustrates a concept of multi-carrier management of one MAC ina BS and FIG. 25 illustrates multi-carrier management of one MAC in aUE.

Referring to FIGS. 24 and 25, one MAC manages and operates one or morefrequency carriers to perform transmission and reception. Sincefrequency carriers managed by a single MAC do not need to be contiguous,this multi-carrier management scheme is more flexible in terms ofresource management. In FIGS. 24 and 25, one Physical layer (PHY) refersto one CC, for convenience of description. Here, one PHY does not alwaysmean an independent Radio Frequency (RF) device. Although oneindependent RF device generally means one PHY, it may include aplurality of PHYs.

FIG. 26 illustrates a concept of multi-carrier management of a pluralityof MACs in a BS, FIG. 27 illustrates a concept of multi-carriermanagement of a plurality of MACs in a UE, FIG. 28 illustrates anotherconcept of multi-carrier management of a plurality of MACs in a BS, andFIG. 29 illustrates another concept of multi-carrier management of aplurality of MACs in a UE.

In addition to the structures illustrated in FIGS. 24 and 25, aplurality of MACs rather than one MAC may control a plurality ofcarriers, as illustrated in FIGS. 26 to 29.

Each MAC may control one carrier in a one-to-one correspondence asillustrated in FIGS. 26 and 27, whereas each MAC may control one carrierin a one-to-one correspondence, for some carriers and one MAC maycontrol one or more of the remaining carriers as illustrated in FIGS. 28and 29.

The above-described system uses a plurality of carriers from one to Ncarriers and the carriers may be contiguous or non-contiguousirrespective of downlink or uplink. A TDD system is configured to use Ncarriers such that downlink transmission and uplink transmission areperformed on each carrier, whereas an FDD system is configured to use aplurality of carriers for each of downlink transmission and uplinktransmission. The FDD system may support asymmetrical CA in whichdifferent numbers of carriers and/or carriers having differentbandwidths are aggregated for downlink and uplink.

When the same number of CCs is aggregated for downlink and uplink, allCCs can be configured to be compatible with the legacy system. However,CCs without compatibility are not excluded from the present invention.

The following description will be given under the assumption that, whena PDCCH is transmitted through downlink component carrier #0, a PDSCHcorresponding to the PDCCH is transmitted through the downlink componentcarrier #0. However, it is apparent that the corresponding PDSCH can betransmitted through another downlink component carrier by applyingcross-carrier scheduling. The term “component carrier” may be replacedwith other equivalent terms (e.g. cell).

FIG. 30 illustrates a scenario of transmitting UCI in a wirelesscommunication system in which CA is supported. For convenience ofdescription, it is assumed in this example that UCI is ACK/NACK (A/N).However, UCI may include control information such as Channel StateInformation (CSI) (e.g. CQI, PMI, and RI) and scheduling requestinformation (e.g. SR), without restriction.

FIG. 30 illustrates exemplary asymmetrical CA in which five DL CCs arelinked to a single UL CC. This asymmetrical CA may be set from theperspective of transmitting UCI. That is, DL CC-UL CC linkage for UCImay be set to be different from DL CC-UL CC linkage for data. For theconvenience, if it is assumed that each DL CC can carry up to twocodewords and the number of ACKs/NACKs for each CC depends on themaximum number of codewords set per CC (for example, if a BS sets up totwo codewords for a specific CC, even though a specific PDCCH uses onlyone codeword on the CC, ACKs/NACKs for the CC are set to 2 which is thesame as the maximum number of codewords), at least two UL ACK/NACK bitsare needed for each DL CC. In this case, to transmit ACKs/NACKs for datareceived on five DL CCs on a single UL CC, at least 10 ACK/NACK bits areneeded. If a Discontinuous Transmission (DTX) state is also to beindicated for each DL CC, at least 12 bits (=5⁶=3125=11.61 bits) arerequired for ACK/NACK transmission. Since up to two ACK/NACK bits areavailable in the conventional PUCCH Formats 1a and 1b, this structurecannot transmit increased ACK/NACK information. While CA is given as anexample of a cause to increase the amount of UCI, this situation mayalso occur due to an increase in the number of antennas and theexistence of a backhaul subframe in a TDD system and a relay system.Similarly to ACK/NACK transmission, the amount of control information tobe transmitted is also increased when control information related to aplurality of DL CCs is transmitted on a single UL CC. For example,transmission of CQI/PMI/RI information related to a plurality of DL CCsmay increase UCI payload.

A DL primary CC may be defined as a DL CC linked with a UL primary CC.Here, linkage includes both implicit linkage and explicit linkage. InLTE, one DL CC and one UL CC are uniquely paired. For example, a DL CClinked with a UL primary CC may be referred to as a DL primary CC,according to LTE pairing. This may be regarded as implicit linkage.Explicit linkage means that a network configures linkage in advance andmay be RRC-signaled. In explicit linkage, a DL CC paired with a ULprimary CC may be referred to as a DL primary CC. The UL primary (oranchor) CC may be a UL CC on which UCI is transmitted through a PUCCH ora PUSCH. The DL primary CC may be configured through higher layersignaling. Otherwise, the DL primary CC may be a DL CC initiallyaccessed by a UE. DL CCs other than the DL primary CC may be referred toas DL secondary CCs. Similarly, UL CCs other than the UL primary CC maybe referred to UL secondary CCs.

In LTE-A, the concept of a cell is used to manage radio resources. Acell is defined as a combination of downlink resources and uplinkresources and the uplink resources are not indispensable elements.Therefore, a cell may be composed of downlink resources only or bothdownlink resources and uplink resources. If CA is supported, the linkagebetween the carrier frequencies (or DL CCs) of downlink resources andthe carrier frequencies (or UL CCs) of uplink resources may be indicatedby system information. A cell operating in primary frequency resources(or a PCC) may be referred to as a primary cell (PCell) and a celloperating in secondary frequency resources (or an SCC) may be referredto as a secondary cell (SCell). The PCell is used for a UE to establishan initial connection or re-establish a connection. The PCell may referto a cell indicated during handover. The SCell may be configured afteran RRC connection is established and may be used to provide additionalradio resources. The PCell and the SCell may collectively be referred toas a serving cell. Accordingly, a single serving cell composed of aPCell only is present for a UE in an RRC CONNECTED state, for which CAis not configured or which does not support CA. On the other hand, oneor more serving cells are present, including a PCell and all SCells, fora UE in RRC CONNECTED state, for which CA is configured. For CA, anetwork may configure one or more SCells in addition to an initiallyconfigured PCell, for a UE supporting CA during a connection setupprocedure after an initial security activation procedure is initiated.

DL-UL pairing may correspond only to FDD. Since TDD uses the samefrequency, DL-UL pairing need not be additionally defined with respectto TDD. DL-UL linkage may be determined from UL linkage through ULE-UTRA Absolute Radio Frequency Channel Number (EARFCN) information ofSIB2. For example, DL-UL linkage may be acquired through SIB2 decodingduring initial access and otherwise, may be acquired through RRCsignaling. Accordingly, only SIB2 linkage is present and other DL-ULpairing need not be explicitly defined. As an example, in the 5DL:1ULstructure of FIG. 30, DL CC#0 and UL CC#0 have an SIB2 linkagerelationship and the remaining DL CCs may have an SIB linkagerelationship with other UL CCs which are not configured for acorresponding UE.

In order to support a scenario such as that of FIG. 30, a new scheme isnecessary. Hereinafter, a PUCCH format for feedback of UCI (e.g.multiple A/N bits) in a communication system supporting CA is referredto as a CA PUCCH format (or PUCCH Format 3). For example, PUCCH Format 3is used to transmit A/N information (possibly, including DTX state)corresponding a PDSCH (or PDCCH) received from multiple DL servingcells.

FIGS. 31 to 36 illustrate the structure of PUCCH Format 3 and a signalprocessing operation for PUCCH Format 3.

FIG. 31 shows the case where PUCCH Format 3 is applied to the structureof PUCCH Format 1 (normal CP). Referring to FIG. 31, a channel codingblock channel-encodes transmission bits a_0, a_1, . . . , a_M−1 (e.g.multiple ACK/NACK bits) and generates coded bits (or a codeword), b_0,b_1, . . . , b_N−1. M is the size of transmission bits and N is the sizeof coded bits. The transmission bits include UCI, for example, multipleACKs/NACKs for a plurality of data (or PDSCHs) received on a pluralityof DL CCs. Herein, the transmission bits a_0, a_1, . . . , a_M−1 arejointly encoded irrespective of the type/number/size of UCI constitutingthe transmission bits. For example, if the transmission bits includemultiple ACKs/NACKs for a plurality of DL CCs, channel coding isperformed on the entire bit information, rather than per DL CC or perACK/NACK bit. A single codeword is generated by channel coding. Channelcoding includes, but is not limited to, repetition, simplex coding, RMcoding, punctured RM coding, Tail-Biting Convolutional Coding (TBCC),Low-Density Parity-Check (LDPC) coding, or turbo coding. Although notshown, the coded bits may be rate-matched, in consideration ofmodulation order and the amount of resources. The rate matching functionmay be partially incorporated into the channel coding block orimplemented in a separate functional block. For example, the channelcoding block may obtain a single codeword by performing (32, 0) RMcoding with respect to a plurality of control information and mayperform cyclic buffer rate-matching.

A modulator generates modulation symbols c_0, c_1, . . . , c_L−1 bymodulating the coded bits b_0, b_1, . . . , b_M−1. L is the size ofmodulation symbols. A modulation scheme is performed by changing theamplitude and phase of a transmission signal. The modulation scheme maybe n-Phase Shift Keying (n-PSK) or n-Quadrature Amplitude Modulation(QAM) (where n is an integer of 2 or more). Specifically, the modulationscheme includes Binary PSB (BPSK), Quadrature (QPSK), 8-PSK, QAM,16-QAM, or 64-QAM.

A divider divides the modulation symbols c_0, c_1, . . . , c_L−1 intoslots. The order/pattern/scheme of dividing modulation symbols intoslots is not limited to a specific one. For instance, the divider maydivide the modulation symbols into slots, sequentially starting from thefirst modulation symbol (localized scheme). In this case, the modulationsymbols c_0, c_1, . . . , c_L/2−1 may be allocated to slot 0 and themodulation symbols c_L/2, c_L/2+1, . . . , c_L−1 may be allocated toslot 1. When the modulation symbols are divided into the slots, themodulation symbols may be interleaved (or permuted). For example,even-numbered modulation symbols may be allocated to slot 0 andodd-numbered modulation symbols may be allocated to slot 1. The divisionprocess and the modulation process are interchangeable in order.

A DFT precoder performs DFT precoding (e.g. 12-point DFT) with respectto the modulation symbols divided into the slots in order to generate asingle carrier waveform. Referring to FIG. 31, the modulation symbolsc_0, c_1, . . . , c_L/2−1 allocated to slot 0 are DFT-precoded to DFTsymbols d_0, d_1, . . . d_L/2−1 and the modulation symbols c_L/2,c_L/2+1, . . . , c_L−1 allocated to slot 1 are DFT-precoded to DFTsymbols d_L/2, d_L/2+1, . . . , d_L−1. DFT precoding may be replacedwith another linear operation (e.g. Walsh precoding).

A spreading block spreads the DFT-precoded signals at an SC-FDMA symbollevel (in the time domain) SC-FDMA symbol-level time-domain spreading isperformed using a spreading code (sequence). The spreading code includesa quasi-orthogonal code and an orthogonal code. The quasi-orthogonalcode includes, but is not limited to, a Pseudo Noise (PN) code. Theorthogonal code includes, but is not limited to, a Walsh code and a DFTcode. While the orthogonal code is described as a typical example of thespreading code for convenience of description, the orthogonal code maybe replaced with the quasi-orthogonal code. The maximum value of aspreading code size or a Spreading Factor (SF) is limited by the numberof SC-FDMA symbols used for transmitting control information. Forexample, if four SC-FDMA symbols are used for transmission of controlinformation in one slot, an orthogonal code of length 4, w0, w1, w2, w3can be used in each slot. The SF means the degree of spreading ofcontrol information and may be related to the multiplexing order orantenna multiplexing order of a UE. The SF may be changed to 1, 2, 3, 4,. . . depending on system requirements. The SF may be predefined betweena BS and a UE or the BS may indicate an SF to the UE by DCI or RRCsignaling. For example, if one of SC-FDMA symbols for controlinformation is punctured to transmit an SRS, a spreading code with adecreased SF (e.g. SF=3 instead of SF=4) may be applied to the controlinformation in a corresponding slot.

A signal generated from the above operation is mapped to subcarriers ina PRB and converted into a time-domain signal by IFFT. A CP is added tothe time-domain signal and the generated SC-FDMA symbols are transmittedthrough an RF end.

On the assumption that ACKs/NACKs are transmitted for five DL CCs, eachoperation will be described in more detail. If each DL CC can transmittwo PDSCHs, ACK/NACK bits for the PDSCHs may be 12 bits, including a DTXstate. Under the assumption of QPSK and time spreading of SF=4, the sizeof a coding block (after rate matching) may be 48 bits. The coded bitsare modulated to 24 QPSK symbols and the QPSK symbols are divided intotwo slots each including 12 QPSK symbols. The 12 QPSK symbols in eachslot are converted into 12 DFT symbols by 12-point DFT. The 12 DFTsymbols in each slot are spread to four SC-FDMA symbols using aspreading code of SF=4 in the time domain and then mapped. Since 12 bitsare transmitted on [2 bits×12 subcarriers×8 SC-FDMA symbols], the codingrate is 0.0625 (= 12/192). If SF=4, a maximum of four UEs may bemultiplexed per PRB.

The signal processing operation described with reference to FIG. 31 isonly exemplary and the signal mapped to the PRB in FIG. 31 may beobtained using various equivalent signal processing operations. Thesignal processing operations equivalent to FIG. 31 will be describedwith reference to FIGS. 32 to 36.

FIG. 32 is different from FIG. 31 in the order of the DFT precoder andthe spreading block. In FIG. 31, since the function of the spreadingblock is equal to multiplication of a DFT symbol sequence output fromthe DFT precoder by a specific constant at an SC-FDMA symbol level, thevalue of the signal mapped to the SC-FDMA symbols is constant even whenthe order of the DFT precoder and the spreading block is changed.Accordingly, the signal processing operation for PUCCH Format 3 may beperformed in order of channel coding, modulation, division, spreadingand DFT precoding. In this case, the division process and the spreadingprocess may be performed by one functional block. For example, themodulation symbols may be spread at the SC-FDMA symbol level while beingalternately divided to slots. As another example, the modulation symbolsare copied to suit the size of the spreading code when the modulationsymbols are divided to slots, and the modulation symbols and theelements of the spreading code may be multiplied in one-to-onecorrespondence. Accordingly, the modulation symbol sequence generated ineach slot is spread to a plurality of SC-FDMA symbols at the SC-FDMAsymbol level. Thereafter, the complex symbol sequence corresponding toeach SC-FDMA symbol is DFT-precoded in SC-FDMA symbol units.

FIG. 33 is different from FIG. 31 in the order of the modulator and thedivider. Accordingly, the signal processing operation for PUCCH Format 3may be performed in order of joint channel coding and division at asubframe level and modulation, DFT precoding and spreading at each slotlevel.

FIG. 34 is different from FIG. 33 in order of the DFT precoder and thespreading block. As described above, since the function of the spreadingblock is equal to multiplication of a DFT symbol sequence output fromthe DFT precoder by a specific constant at an SC-FDMA symbol level, thevalue of the signal mapped to the SC-FDMA symbols is constant even whenthe order of the DFT precoder and the spreading block is changed.Accordingly, the signal processing operation for PUCCH Format 3 may beperformed by joint channel coding and division at a subframe level andmodulation at each slot level. The modulation symbol sequence generatedin each slot is spread to a plurality of SC-FDMA symbols at the SC-FDMAsymbol level and the modulation symbol sequence corresponding to eachSC-FDMA symbol is DFT-precoded in SC-FDMA symbol units. In this case,the modulation process and the spreading process may be performed by onefunctional block. For example, the generated modulation symbols may bedirectly spread at the SC-FDMA symbol level while the encoded bits aremodulated. As another example, the modulation symbols are copied to suitthe size of the spreading code when the encoded bits are modulated, andthe modulation symbols and the elements of the spreading code may bemultiplied in one-to-one correspondence.

FIG. 35 shows the case where PUCCH Format 3 is applied to the structureof PUCCH Format 2 (normal CP) and FIG. 36 shows the case where PUCCHFormat 3 is applied to the structure of PUCCH Format 2 (extended CP).The basic signal processing operation is equal to those described withrespect to FIGS. 31 to 34. As the structure of PUCCH Format 2 of thelegacy LTE is reused, the number/locations of UCI SC-FDMA symbols and RSSC-FDMA symbols in PUCCH Format 3 is different from that of FIG. 31.

Table 14 shows the location of the RS SC-FDMA symbol in PUCCH Format 3.It is assumed that the number of SC-FDMA symbols in a slot is 7 (indexes0 to 6) in the normal CP case and the number of SC-FDMA symbols in aslot is 6 (indexes 0 to 5) in the extended CP case.

TABLE 14 SC-FDMA symbol location of RS Normal CP Extended CP Note PUCCH2, 3, 4 2, 3 Reuse of PUCCH Format 3 Format 1 1, 5 3 Reuse of PUCCHFormat 2

Here, the RS may reuse the structure of the legacy LTE. For example, anRS sequence may be defined using cyclic shift of a base sequence (seeEquation 1).

In the meantime, the multiplexing capacity of a data part is 5 due toSF=5. However, the multiplexing capacity of an RS part is determined bya CS interval Δ_(shift) ^(PUCCH). For example, the multiplexing capacitymay be 12/Δ_(shift) ^(PUCCH). In this case, the multiplexing capacitiesfor the cases in which Δ_(shift) ^(PUCCH)=1, Δ_(shift) ^(PUCCH)=2, andΔ_(shift) ^(PUCCH)=3 are 12, 6, and 4, respectively. In FIGS. 35 and 36,while the multiplexing capacity of the data part is 5 due to SF=5, themultiplexing capacity of the RS part is 4 in case of Δ_(shift) ^(PUCCH).Therefore, an overall multiplexing capacity may be limited to thesmaller of the two values, 4.

FIG. 37 illustrates an exemplary structure of PUCCH Format 3 in which amultiplexing capacity is increased. Referring to FIG. 37, SC-FDMAsymbol-level spreading in a slot is applied to an RS part. Then, themultiplexing capacity of the RS part is doubled. That is, themultiplexing capacity of the RS part is 8 even in case of Δ_(shift)^(PUCCH)=3, thereby preventing the multiplexing capacity of a UCI datapart from being reduced. An OCC for RSs may include, without beinglimited to, a Walsh cover of [y1 y2]=[1 1] or [1 −1] or lineartransformation thereof (e.g. [j j] [j −j], [1 j] [1−j], etc.). y1 isapplied to the first RS SC-FDMA symbol of a slot and y2 is applied tothe second RS SC-FDMA symbol of a slot.

FIG. 38 illustrates another structure of PUCCH Format 3 in whichmultiplexing capacity is increased. If slot-level frequency hopping isnot performed, the multiplexing capacity may be doubled again by furtherapplying spreading or covering (e.g. Walsh covering) in slot units. Ifslot-level frequency hopping is performed, application of Walsh coveringin slot units may not maintain orthogonality due to a channel conditionexperienced in each slot. A slot-level spreading code (e.g. OCC) for RSsmay include, without being limited to, a Walsh cover of [x1 x2]=[1 1] or[1 −1] or linear transformation thereof (e.g. [j j] [j −j], [1 j] [1−j], etc.). x1 is applied to the first slot and x2 is applied to thesecond slot. While FIG. 38 shows SC-FDMA symbol-level spreading (orcovering) after slot-level spreading (or covering), a spreading (orcovering) order may be changed.

The signal processing procedure of PUCCH Format 3 will now be describedusing equations. For convenience, it is assumed that a length-5 OCC isused (e.g. FIGS. 34 to 38).

The block of bits b(0), . . . , b(M_(bit)−1) is scrambled with aUE-specific scrambling sequence. The block of bits b(0), . . . ,b(M^(bit)−1) may be corresponding to coded bits b_0, b_1, b_N−1 of FIG.31. The block of bits b(0), . . . , b(M^(bit)−1) includes at least oneof ACK/NACK bit, CSI bit, SR bit. A block of scrambled bits {tilde over(b)}(0), . . . , {tilde over (b)}(M_(bit)−1) may be generated by theequation below.{tilde over (b)}(i)=(b(i)+c(i)) mod 2   [Equation 10]

where c(i) denotes the scrambling sequence. c(i) includes pseudo-randomsequences are defined by a length-31 Gold sequence and may be generatedby the following equation where mod denotes the modulo operation.c(n)=(x ₁(n+N _(C))+x ₂(n+N _(C))) mod 2x ₁(n+31)=(x ₁(n+3)+x ₁(n)) mod 2x ₂(n+31)=(x ₂(n+3)+x ₂(n+2)+x ₂(n+1)+x ₂(n)) mod 2   [Equation 11]

where N_(C)=1600 and the first m-sequence is initialized with x₁(0)=1,x₁(n)=0, n=1, 2, . . . , 30. The initialization of the second m-sequenceis given by c_(init)=Σ_(i=0) ³⁰x₂(i)·2^(i). c_(init) may be initializedwith c_(init)=(└n_(s)/2┘+1)·(2N_(ID) ^(cell)+1)·2¹⁶+n^(RNTI) at thestart of each subframe. n_(s) is a slot number within a radio frame.N_(ID) ^(cell) is physical layer cell identity. n_(RNTI) is radionetwork temporary identifier.

The block of scrambled bits {tilde over (b)}(0), . . . , {tilde over(b)}(M_(bit)−1) is modulated, resulting in a block of complex-valuedmodulation symbols d(0), . . . , d(M_(symb)−1). When QPSK modulated,M_(symb)=M_(bit)/2=2N_(sc) ^(RB). The block of complex-valued modulationsymbols d(0), . . . , d(M_(symb)−1) is corresponding to modulationsymbol c_0, c_1, c_N−1 at FIG. 31.

The complex-valued modulation symbols d(0), . . . , d(M_(symb)−1) areblock-wise spread with the orthogonal sequence w_(n) _(oc) (i) resultingin N_(SF,0) ^(PUCCH)+N_(SF,1) ^(PUCCH) sets of complex-valued symbolsaccording to the following equation. The divide/spread procedure of FIG.32 is performed by the following equation. Each complex-valued symbol iscorresponding to an SC-FDMA symbol, and has N_(sc) ^(RB) complex-valuedmodulation values (e.g. 12 complex-valued modulation values).

$\begin{matrix}{{y_{n}(i)} = \left\{ {{{\begin{matrix}{{w_{n_{{oc},}0}\left( \overset{\_}{n} \right)} \cdot {\mathbb{e}}^{j\;\pi{{\lfloor{{n_{cs}^{cell}{({n_{s},l})}}/64}\rfloor}/2}} \cdot {d(i)}} & {n < N_{{SF},0}^{PUCCH}} \\{{w_{n_{oc},1}\left( \overset{\_}{n} \right)} \cdot {\mathbb{e}}^{j\;\pi{{\lfloor{{n_{cs}^{cell}{({n_{s},l})}}/64}\rfloor}/2}} \cdot {d\left( {N_{sc}^{RB} + i} \right)}} & {otherwise}\end{matrix}\mspace{20mu}\overset{\_}{n}} = {{n\mspace{11mu}{mod}\; N_{{SF},0}^{PUCCH}\mspace{20mu} n} = 0}},\ldots\mspace{14mu},{{N_{{SF},0}^{PUCCH} + N_{{SF},1}^{PUCCH} - {1\mspace{20mu} i}} = 0},1,\ldots\mspace{14mu},{N_{sc}^{RB} - 1}} \right.} & \left\lbrack {{Equation}\mspace{14mu} 12} \right\rbrack\end{matrix}$

Here, N_(SF,0) ^(PUCCH) and N_(SF,1) ^(PUCCH) correspond to the numberof SC-FDMA symbols used for PUCCH transmission at slot 0 and slot 1,respectively. N_(SF,0) ^(PUCCH)=N_(SF,1) ^(PUCCH)=5 for both slots in asubframe using normal PUCCH format 3 and N_(SF,0) ^(PUCCH)=5, N_(SF,1)^(PUCCH)=4 holds for the first and second slot, respectively, in asubframe using shortened PUCCH format 3. w_(n) _(oc) _(,0)(i) and w_(n)_(oc) _(,1)(i) indicate orthogonal sequences applied to slot 0 and slot1, respectively and are given by Table 15 shown below. n_(oc) denotes anorthogonal sequence index (or an orthogonal code index). └ ┘ denotes aflooring function. n_(cs) ^(cell)(n_(s), l) may be given by n_(cs)^(cell)(n_(s), l)=Σ_(i=0) ⁷c(8N_(symb) ^(UL)·n_(s)+8l+i)·2^(i). c(i) maybe given by Equation 11 and may be initialized to c_(init)=N_(ID)^(cell) at the beginning of every radio frame.

Table 15 shows a sequence index n_(oc) and an orthogonal sequence w_(n)_(oc) (i).

TABLE 15 Sequence index Orthogonal sequence [w_(n) _(oc) (0) . . . w_(n)_(oc) (N_(SF) ^(PUCCH) −1] n_(oc) N_(SF) ^(PUCCH) = 5 N_(SF) ^(PUCCH) =4 0 [1 1 1 1 1] [+1 +1 +1 +1] 1 [1 e^(j2π/5) e^(j4π/5) e^(j6π/5)e^(j8π/5)] [+1 −1 +1 −1] 2 [1 e^(j4π/5) e^(j8π/5) e^(j2π/5) e^(j6π/5)][+1 −1 +1 +1] 3 [1 e^(j6π/5) e^(j2π/5) e^(j8π/5) e^(j4π/5)] [+1 −1 −1+1] 4 [1 e^(j8π/)5 e^(j6π/5) e^(j4π/5) e^(j2π/5)] —

In Table 15, an orthogonal sequence (or code) of N_(SF) ^(PUCCH)=5 isgenerated by the following equation.

$\begin{matrix}\begin{bmatrix}{\mathbb{e}}^{j\frac{2{\pi \cdot 0 \cdot n_{oc}}}{5}} & {\mathbb{e}}^{j\frac{2{\pi \cdot 1 \cdot n_{oc}}}{5}} & {\mathbb{e}}^{j\frac{2{\pi \cdot 2 \cdot n_{oc}}}{5}} & {\mathbb{e}}^{j\frac{2{\pi \cdot 3 \cdot n_{oc}}}{5}} & {\mathbb{e}}^{j\frac{2{\pi \cdot 4 \cdot n_{oc}}}{5}}\end{bmatrix} & \left\lbrack {{Equation}\mspace{14mu} 13} \right\rbrack\end{matrix}$

Resources used for transmission of PUCCH formats 3 are identified by aresource index n_(PUCCH) ⁽³⁾. For example, n_(oc) may be given byn_(oc)=n_(PUCCH) ⁽³⁾ mod N_(SF,3) ^(PUCCH). n_(PUCCH) ⁽³⁾ may beindicated through a Transmit Power Control (TPC) field of an SCellPDCCH. More specifically, n_(oc) for each slot may be given thefollowing equation.

$\begin{matrix}{{n_{{oc},0} = {n_{PUCCH}^{(3)}{mod}{\;\;}N_{{SF},1}^{PUCCH}}}{n_{{oc},1} = \left\{ \begin{matrix}{\left( {3n_{{oc},0}} \right){mod}\mspace{11mu} N_{{SF},1}^{PUCCH}} & {{{if}\mspace{14mu} N_{{SF},1}^{PUCCH}} = 5} \\{n_{{oc},0}{mod}\mspace{11mu} N_{{SF},1}^{PUCCH}} & {otherwise}\end{matrix} \right.}} & \left\lbrack {{Equation}\mspace{14mu} 14} \right\rbrack\end{matrix}$

where n_(oc,0) denotes a sequence index value n_(oc) for slot 0 andn_(oc,1) denotes a sequence index value n_(oc) for slot 1. In case ofnormal PUCCH Format 3, N_(SF,0) ^(PUCCH)=N_(SF,1) ^(PUCCH)=5. In case ofshortened PUCCH Format 3, N_(SF,0) ^(PUCCH)=5 and N_(SF,1) ^(PUCCH)=4.

Each set of complex-valued symbols may be cyclically shifted accordingto{tilde over (y)} _(n)(i)=y _(n)((i+n _(cs) ^(cell)(n _(s) ,l)) mod N_(sc) ^(RB))   [Equation 15]

where n_(s) denotes a slot number in a radio frame and l denotes anSC-FDMA symbol number in a slot. n_(cs) ^(cell)(n_(s), l) is defined byEquation 12. n=0, . . . , N_(SF,0) ^(PUCCH)+N_(SF,1) ^(PUCCH)−1.

The shifted sets of complex-valued symbols are transform precodedaccording to the following equation, resulting a block of complex-valuedsymbols z(0), . . . , z((N_(SF,0) ^(PUCCH)+N_(SF,1) ^(PUCCH))N_(sc)^(RB)−1).

$\begin{matrix}{{{z\left( {{n \cdot N_{sc}^{RB}} + k} \right)} = {\frac{1}{\sqrt{P}}\frac{1}{\sqrt{N_{sc}^{RB}}}{\sum\limits_{i = 0}^{N_{sc}^{RB} - 1}\;{{{\overset{\sim}{y}}_{n}(i)}{\mathbb{e}}^{{- j}\frac{2\;{\pi\mathbb{i}}\; k}{N_{sc}^{RB}}}}}}}{{k = 0},\ldots\mspace{14mu},{N_{sc}^{RB} - 1}}{{n = 0},\ldots\mspace{14mu},{N_{{SF},0}^{PUCCH} + N_{{SF},1}^{PUCCH} - 1}}} & \left\lbrack {{Equation}\mspace{14mu} 16} \right\rbrack\end{matrix}$

Complex symbol blocks z(0), . . . , z((N_(SF,0) ^(PUCCH)+N_(SF,1)^(PUCCH))N_(sc) ^(RB)−1) are mapped to physical resources after powercontrol. A PUCCH uses one resource block in each slot of a subframe. Inthe resource block, z(0), . . . , z((N_(SF,0) ^(PUCCH)+N_(SF,1)^(PUCCH))N_(sc) ^(RB)−1) are mapped to a resource element (k, l) whichis not used for RS transmission (see Table 14). Mapping is performed inascending order of k, l, and a slot number, starting from the first slotof a subframe. k denotes a subcarrier index and l denotes an SC-FDMAsymbol index in a slot.

Next, UL transmission mode configuration is described. A transmissionmode for the PUCCH is roughly defined as two modes: one is asingle-antenna transmission mode and the other is a multi-antennatransmission mode. The single-antenna transmission mode is a method inwhich a UE transmits signals through a single antenna or a receiving end(e.g. BS) recognizes transmission as signal transmission of the UEthrough a single antenna, during PUCCH transmission. In the latter case,the UE may use a scheme such as virtualization (e.g. Precoding VectorSwitching (PVS), antenna selection, Cyclic Delay Diversity (CDD), etc.)while transmitting signals through multiple antennas. The multi-antennatransmission mode may be a method in which the UE transmits signals tothe BS through multiple antennas using a transmission diversity or MEMOscheme. The transmission diversity scheme used in the multi-antennatransmission mode may apply Spatial Orthogonal Resource TransmitDiversity (SORTD) or Space-Code Block Coding (SCBC). In thisspecification, the multi-antenna transmission mode is referred to as anSORTD mode for convenience unless otherwise mentioned, but the presentinvention is not limited thereto.

FIG. 39 illustrates a signal processing block/operation for SORTD. Abasic operation except for a multi-antenna transmission process isidentical to the operation described with reference to FIGS. 31 to 38.Referring to FIG. 39, modulation symbols c_0, . . . , c_23 areDFT-precoded and then are transmitted through resources (e.g. an OC, aPRB, or a combination thereof) given for each antenna port. While thisexample illustrates a situation that one DFT operation is performed fora plurality of antenna ports, the DFT operation may be performed perantenna port. In addition, although DFT precoded symbols d_0, . . . ,d_23 are transmitted through the second OC/PRB in a copied form, amodified form (e.g. complex conjugate or scaling) of the DFT precodedsymbols d_0, . . . , d_23 may be transmitted through the second OC/PRB.For example, [OC⁽⁰⁾≠OC⁽¹⁾; PRB⁽⁰⁾=PRB⁽¹⁾], [OC⁽⁰⁾=OC⁽¹⁾; PRB⁽⁰⁾≠PRB⁽¹⁾],and [OC⁽⁰⁾≠OC⁽¹⁾; PRB⁽⁰⁾≠PRB⁽¹⁾] are possible in order to guaranteeorthogonality between PUCCH signals transmitted through differentantenna ports. Here, numbers in superscripts denote antenna port numbersor values corresponding thereto.

FIG. 40 is a schematic diagram explaining an SORTD operation. Referringto FIG. 40, a UE acquires a first resource index and a second resourceindex (S3310). Here, a resource index (or a resource value) indicates aPUCCH resource index (or PUCCH resource value), preferably, a PUCCHFormat 3 resource index (or PUCCH Format 3 resource value). Step S3310may include a plurality of steps different in time. A method foracquiring the first resource index and the second resource index will bedescribed in detail later. Next, the UE transmits a PUCCH signal using aPUCCH resource corresponding to the first resource index through a firstantenna (port) (S3320). The UE transmits a PUCCH signal using a PUCCHresource corresponding to the second resource index through a secondantenna (port) (S3330). Steps S3320 and S3330 are performed in the sameframe.

The PUCCH signal may include HARQ-ACK. HARQ-ACK includes a response to adownlink signal, (e.g. ACK, NACK, DTX, or NACK/DTX). If the PUCCH signalincludes HARQ-ACK, the procedure of FIG. 40 further includes a processof receiving the downlink signal although not shown in FIG. 40. Theprocess of receiving the downlink signal includes receiving a PUCCH fordownlink scheduling and receiving a PDSCH corresponding to the PDCCH.For PUCCH Format 3 transmission, at least one of the PDCCH and PDSCH maybe received on an SCell.

As described with reference to FIGS. 39 and 40, multi-antenna (port)transmission (e.g. SORTD) requires greater orthogonal resources thansingle-antenna (port) transmission. For example, SORTD transmission oftwo antennas (2Tx) requires twice the orthogonal resources thansingle-antenna (port) transmission. Accordingly, the antenna (port)transmission mode is associated with the number of UEs that can bemultiplexed in a resource region for the PUCCH, i.e. multiplexingcapacity. Therefore, a BS needs to flexibly configure the antenna (port)transmission mode according to the number of communicating UEs. Forexample, if the number of UEs included in the BS is small, themulti-antenna (port) transmission mode (e.g. SORTD mode) using multipleresources may be configured for the UEs. If the number of UEs includedin the BS is large, the single-antenna (port) transmission mode using asingle resource may be configured. The antenna (port) transmission modefor PUCCH transmission may be configured through RRC signaling.Furthermore, the antenna (port) transmission mode may be independentlyconfigured for each PUCCH format. For example, antenna (port)transmission modes for PUCCH Format 1, PUCCH Format 1a/1b, PUCCH Format2/2a/2b, PUCCH Format 3, and PUCCH 1b based on channel selection in CAmay be independently configured.

The present invention proposes various methods for resource allocation(see step S3310 of FIG. 40) in an environment using multiple resourcesfor multi-antenna (port) transmission in PUCCH Format 3. For example,when 2Tx SORTD is applied to PUCCH Format 3, two orthogonal resourcesare needed and, thus, an allocation rule for the two orthogonalresources is necessary.

First, single-antenna (port) transmission requiring one orthogonalresource will be described. Resource allocation for PUCCH Format 3 isbased on explicit resource allocation. Specifically, a UE may beexplicitly assigned PUCCH resource value candidate(s) for PUCCH Format 3(or a PUCCH resource value candidate set) (e.g. n_(PUCCH,x) ⁽³⁾ (x=0, 1,. . . , N)) in advance through higher layer (e.g. RRC) signaling. Next,the BS may transmit an ACK/NACK Resource Indicator (ARI) (in otherwords, an HARQ-ACK resource value) to the UE and the UE may determine aPUCCH resource value n_(PUCCH) ⁽³⁾ used for actual PUCCH transmissionthrough the ARI. The PUCCH resource value n_(PUCCH) ⁽³⁾ is mapped to aPUCCH resource (e.g. an OC or a PRB). The ARI may be used to directlyindicate which of the PUCCH resource candidate(s) (or a PUCCH resourcevalue candidate set) provided by a higher layer in advance will be used.According to an example of implementation, the ARI may represent anoffset value relative to a PUCCH resource value signaled (by the higherlayer). A Transmit Power Control (TPC) field in a PDSCH-scheduling PDCCH(SCell PDCCH) transmitted on an SCell may be reused for the ARI.Meanwhile, a TPC field of a PDSCH-scheduling PDCCH (PCell PDCCH)transmitted on a PCell may be used for PUCCH power control which is anoriginal purpose thereof. 3GPP Rel-10 does not allow a PDSCH of a PCellto be cross-carrier scheduled by an SCell, receiving the PDSCH on thePCell only may include the same meaning as receiving the PDCCH on thePCell only.

Specifically, when PUCCH resources for A/N are preliminarily allocatedby RRC signaling, resources used for actual PUCCH transmission may bedetermined as follows.

-   -   The PDCCH corresponding to the PDSCH on the SCell(s) (or the        PDCCH on the SCell(s) corresponding to the PDSCH) indicates one        of the RRC-configured PUCCH resource(s) using the ARI (in other        words, the HARQ-ACK resource value).    -   If the PDCCH corresponding to the PDSCH on the SCell(s) (or the        PDCCH on the SCell(s) corresponding to the PDSCH) is not        detected and if the PDSCH is received on the PCell, any one of        the following methods may be applied.        -   An implicit A/N PUCCH resource (i.e. PUCCH Format 1a/1b            resource obtained using the lowest CCE constituting the            PUCCH) according to legacy 3GPP Rel-8 is used.        -   The PDCCH corresponding to the PDSCH on the PCell (or the            PDCCH on the PCell corresponding to the PDSCH) indicates one            of resources configured by RRC using the ARI (in other            words, HARQ-ACK resource value).    -   It is assumed that all the PDCCHs corresponding to the PDSCHs on        the SCells (or the PDCCHs on the SCell(s) corresponding to the        PDSCHs) have the same ARI (in other words, HARQ-ACK resource        value).

The ARI (in other words, HARQ-ACK resource value) may be an X-bit and,if the TPC field of the SCell PDCCH is reused, X may be 2. Forconvenience, it is assumed that X is 2.

Hereinafter, a resource allocation method for supporting various antenna(port) transmission modes when control information is transmitted usingPUCCH Format 3 will be described.

For example, a UE may be assigned four orthogonal resources, forexample, PUCCH resource values n_(PUCCH,0) ⁽³⁾, n_(PUCCH,1) ⁽³⁾,n_(PUCCH,2) ⁽³⁾, and n_(PUCCH,3) ⁽³⁾ for PUCCH Format 3 through RRCsignaling (e.g. four RRC signals). In addition, the UE may be assignedone set {n_(PUCCH,0) ⁽³⁾, n_(PUCCH,1) ⁽³⁾, n_(PUCCH,2) ⁽³⁾, n_(PUCCH,3)⁽³⁾} composed of four PUCCH resource values through one RRC signaling.Thereafter, the UE may detect a PDCCH signal and receive a PDSCH signalcorresponding to the PDCCH. At least one of the PDCCH signal and thePDSCH single may be received through an SCell. Next, the UE maydetermine a PUCCH resource value n_(PUCCH) ⁽³⁾ to be used for actualPUCCH transmission according to a bit value of an ARI (in other words,an HARQ-ACK resource value) in the PDCCH signal. The determined PUCCHresource value is mapped to a PUCCH resource (e.g. an OC or PRB). UCI(e.g. HARQ-ACK for PDSCH) is transmitted to a network (e.g. a BS or arelay) using the PUCCH resource mapped from the PUCCH resource value.The above-described method is shown in Table 16.

TABLE 16 HARQ-ACK Resource Indicator (ARI) for PUCCH n_(PUCCH) ⁽³⁾ 001^(st) PUCCH resource value (n_(PUCCH,0) ⁽³⁾) configured by higherlayers 01 2^(nd) PUCCH resource value (n_(PUCCH,1) ⁽³⁾) configured byhigher layers 10 3^(rd) PUCCH resource value (n_(PUCCH,2) ⁽³⁾)configured by higher layers 11 4^(th) PUCCH resource value (n_(PUCCH,3)⁽³⁾) configured by higher layers

Here, HARQ-ACK indicates an HARQ ACK/NACK/DTX response to a downlinktransport block. The HARQ ACK/NACK/DTX response includes ACK, NACK, DTX,and NACK/DTX.

If it is assumed that an ARI (in other words, HARQ-ACK resource value)is transmitted using a TPC field of an SCell PDCCH, the UE is unable todiscern the ARI and a PUCCH resource value associated with the ARI uponreceiving the PDSCH only on the PCell (or upon receiving the PDCCH onlyon the PCell). Accordingly, when a corresponding event occurs, fallbackusing the existing 3GPP Rel-8/9 PUCCH resource and Rel-8/9 PUCCH Format1a/1b may be applied.

Next, a method for allocating a plurality of orthogonal resources fortransmission diversity (e.g. SORTD) will be described. For convenience,it is assumed that two orthogonal resources are used.

In this case, the UE may be assigned 8 orthogonal resources, forexample, PUCCH resource value n_(PUCCH,0) ⁽³⁾, n_(PUCCH,1) ⁽³⁾,n_(PUCCH,2) ⁽³⁾, n_(PUCCH,3) ⁽³⁾, n_(PUCCH,4) ⁽³⁾, n_(PUCCH,5) ⁽³⁾,n_(PUCCH,6) ⁽³⁾, and n_(PUCCH,7) ⁽³⁾ for PUCCH Format 3 through RRCsignaling (e.g. 8 RRC signals). In addition, the UE may be assigned oneset {n_(PUCCH,0) ⁽³⁾, n_(PUCCH,1) ⁽³⁾, n_(PUCCH,2) ⁽³⁾, n_(PUCCH,3) ⁽³⁾,n_(PUCCH,4) ⁽³⁾, n_(PUCCH,5) ⁽³⁾, n_(PUCCH,6) ⁽³⁾, n_(PUCCH,7) ⁽³⁾}composed of 8 PUCCH) resource values through one RRC signal. Next, theUE detects a PDCCH signal and may receive a PDSCH signal correspondingto the PDCCH signal. At least one of the PDCCH signal and the PDSCHsignal may be received through an SCell. The UE may determine a PUCCHresource value n_(PUCCH) ^((3,p)) to be used for actual PUCCHtransmission according to a bit value of an ARI (in other words,HARQ-ACK resource value) in the PDCCH. Here, p denotes an antenna portnumber or a value related thereto. The determined PUCCH resource valueis mapped to a PUCCH resource (e.g. an OC or PRB). UCI (e.g. HARQ-ACKfor a PDSCH) is transmitted to a network (e.g. a BS or a relay) usingthe PUCCH resource mapped from the PUCCH resource value.

In case of the multi-antenna port transmission mode, one ARI is used toindicate a plurality of PUCCH resource values. The plurality of PUCCHresource values indicated by the ARI are respectively mapped to PUCCHresources for respective corresponding antenna ports. Accordingly, theARI may indicate one or multiple PUCCH resource values according towhether an antenna port transmission mode is a single antenna port modeor a multi-antenna port mode. Table 17 shows the above-described method.

TABLE 17 HARQ-ACK n_(PUCCH) ^((3,p)) Resource Indicator p = p0 p = p1(ARI) for PUCCH (e.g. antenna port 0) (e.g. antenna port 1) 00 1^(st)PUCCH resource value 5^(th) PUCCH resource value (n_(PUCCH,0) ⁽³⁾)configured by (n_(PUCCH,4) ⁽³⁾) configured by higher layers higherlayers 01 2^(nd) PUCCH resource value 6^(th) PUCCH resource value(n_(PUCCH,1) ⁽³⁾) configured by (n_(PUCCH,5) ⁽³⁾) configured by higherlayers higher layers 10 3^(rd) PUCCH resource value 7^(th) PUCCHresource value (n_(PUCCH,2) ⁽³⁾) configured by (n_(PUCCH,6) ⁽³⁾)configured by higher layers higher layers 11 4^(th) PUCCH resource value8^(th) PUCCH resource value (n_(PUCCH,3) ⁽³⁾) configured by (n_(PUCCH,7)⁽³⁾) configured by higher layers higher layers

As another example, the UE may be assigned four orthogonal resources(e.g. PUCCH resource values) per antenna port through RRC signaling.Thereafter, the UE may detect a PDCCH signal and receive a PDSCH signalcorresponding to the PDCCH. At least one of the PDCCH signal and thePDSCH single may be received through an SCell. Next, the UE maydetermine a final PUCCH resource value n_(PUCCH) ⁽³⁾ to be used for eachantenna port according to a bit value of an ARI (in other words, anHARQ-ACK resource value) in the PDCCH signal. The determined PUCCHresource value is mapped to a PUCCH resource (e.g. an OC or PRB) for acorresponding antenna port. p denotes an antenna port number or a valuerelated thereto. Table 18 shows the above-described method.

-   -   n_(PUCCH,0) ^((3,0)), n_(PUCCH,1) ^((3,0)), n_(PUCCH,2)        ^((3,0)), n_(PUCCH,3) ^((3,0))→used for antenna port p0 (e.g.        p0=0)    -   n_(PUCCH,0) ^((3,1)), n_(PUCCH,1) ^((3,1)), n_(PUCCH,2)        ^((3,1)), n_(PUCCH,3) ^((3,1))→used for antenna port p1 (e.g.        p1=1)

TABLE 18 HARQ-ACK n_(PUCCH) ^((3,p)) Resource Indicator p = p0 p = p1(ARI) for PUCCH (e.g. antenna port 0) (e.g. antenna port 1) 00 1^(st)PUCCH resource value 1^(st) PUCCH resource value (n_(PUCCH,0) ^((3,0)))configured (n_(PUCCH,0) ^((3,1))) configured by higher layers by higherlayers 01 2^(nd) PUCCH resource value 2^(nd) PUCCH resource value(n_(PUCCH,1) ^((3,0))) configured (n_(PUCCH,1) ^((3,1))) configured byhigher layers by higher layers 10 3^(rd) PUCCH resource value 3^(rd)PUCCH resource value (n_(PUCCH,2) ^((3,0))) configured (n_(PUCCH,2)^((3,1))) configured by higher layers by higher layers 11 4^(th) PUCCHresource value 4^(th) PUCCH resource value (n_(PUCCH,3) ^((3,0)))configured (n_(PUCCH,3) ^((3,3))) configured by higher layers by higherlayers

In addition, the UE may be assigned one set {n_(PUCCH,0) ^((3,0)),n_(PUCCH,1) ^((3,0)), n_(PUCCH,2) ^((3,0)), n_(PUCCH,3) ^((3,0)),n_(PUCCH,0) ^((3,1)), n_(PUCCH,1) ^((3,1)), n_(PUCCH,2) ^((3,1)),n_(PUCCH,3) ^((3,1))} composed of 8 orthogonal resources, for example,PUCCH resources through one RRC signal. According to a bit value of anARI, the UE may determine a final PUCCH resource value n_(PUCCH)^((3,p)) to be used per antenna port and a PUCCH resource correspondingto the PUCCH resource value. Table 19 shows the above-described method.

TABLE 19 HARQ-ACK n_(PUCCH) ^((3,p)) Resource Indicator p = p0 p = p1(ARI) for PUCCH (e.g. antenna port 0) (e.g. antenna port 1) 00 1^(st)PUCCH resource value 5^(th) PUCCH resource value (n_(PUCCH,0) ^((3,0)))configured (n_(PUCCH,0) ^((3,1))) configured by higher layers by higherlayers 01 2^(nd) PUCCH resource value 6^(th) PUCCH resource value(n_(PUCCH,1) ^((3,0))) configured (n_(PUCCH,1) ^((3,1))) configured byhigher layers by higher layers 10 3^(rd) PUCCH resource value 7^(th)PUCCH resource value (n_(PUCCH,2) ^((3,0))) configured (n_(PUCCH,2)^((3,1))) configured by higher layers by higher layers 11 4^(th) PUCCHresource value 8^(th) PUCCH resource value (n_(PUCCH,3) ^((3,0)))configured (n_(PUCCH,3) ^((3,3))) configured by higher layers by higherlayers

Tables 17 to 19 show the case in which a part of p=p0 of allocation ofPUCCH resource values for multiple antenna ports has the sameconfiguration as the case of a single antenna port. That is, it isassumed that Tables 17 to 19 have a nested structure. Therefore, bothsingle-antenna port transmission and multiple-antenna port transmissioncan be supported through one common table.

Referring to Table 18, the nested structure is shown in more detail. Inthe nested structure, one common table may be used. Table 20 illustratesa common table for a single/multiple-antenna port transmission mode.

TABLE 20 HARQ-ACK Resource Indicator (ARI) for PUCCH n_(PUCCH) ^((3,p))00 1^(st) PUCCH resource value configured by higher layers 01 2^(nd)PUCCH resource value configured by higher layers 10 3^(rd) PUCCHresource value configured by higher layers 11 4^(th) PUCCH resourcevalue configured by higher layers

If a UE is configured as a single antenna port transmission mode inassociation with PUCCH transmission, Table 20 may be interpreted asshown in Table 21. Accordingly, when the UE is configured as the singleantenna port transmission mode, a PUCCH resource value n_(PUCCH)^((3,p)), indicated by an ARI is finally mapped to one PUCCH resourcen_(PUCCH) ^((3,p0)), for a single antenna port (e.g. p0).

TABLE 21 HARQ-ACK Resource Indicator n_(PUCCH) ^((3,p)) (ARI) for PUCCHn_(PUCCH) ^((3,p)) → (p = p0) 00 1^(st) PUCCH resource value n_(PUCCH,0)^((3,p0)) configured by higher layers 01 2^(nd) PUCCH resource valuen_(PUCCH,1) ^((3,p0)) configured by higher layers 10 3^(rd) PUCCHresource value n_(PUCCH,2) ^((3,p0)) configured by higher layers 114^(th) PUCCH resource value n_(PUCCH,3) ^((3,p0)) configured by higherlayers

In the case where the UE is configured as a multi-antenna porttransmission mode in association with PUCCH transmission, Table 20 maybe interpreted as shown in Table 22. Accordingly, when the UE isconfigured as the multi-antenna port transmission mode, PUCCH resourcevalues n_(PUCCH) ^((3,p)) indicated by the ARI are finally mapped to aplurality of PUCCH resources n_(PUCCH) ^((3,p0)) and n_(PUCCH) ^((3,p1))for multiple antenna ports (e.g. p0 and p1).

TABLE 22 HARQ-ACK Resource Indicator n_(PUCCH) ^((3,p)) n_(PUCCH)^((3,p)) (ARI) for PUCCH n_(PUCCH) ^((3,p)) → (p = p0) (p = p1) 001^(st) PUCCH resource n_(PUCCH,0) ^((3,p0)) n_(PUCCH,0) ^((3,p1)) valueconfigured by higher layers 01 2^(nd) PUCCH resource n_(PUCCH,1)^((3,p0)) n_(PUCCH,1) ^((3,p1)) value configured by higher layers 103^(rd) PUCCH resource n_(PUCCH,2) ^((3,p0)) n_(PUCCH,2) ^((3,p1)) valueconfigured by higher layers 11 4^(th) PUCCH resource n_(PUCCH,3)^((3,p0)) n_(PUCCH,3) ^((3,p1)) value configured by higher layers

Another example for allocating multiple (e.g. two) orthogonal resourcesfor transmission diversity, for example, SORTD will now be described.For example, it is assumed that the UE is assigned four orthogonalresources for PUCCH Format 3, for example, PUCCH resource valuesn_(PUCCH,0) ⁽³⁾, n_(PUCCH,1) ⁽³⁾, n_(PUCCH,2) ⁽³⁾, and n_(PUCCH,3) ⁽³⁾through RRC signaling (e.g. RRC signals). The same is obtained evenunder the assumption that the UE is assigned one set {n_(PUCCH,0) ⁽³⁾,n_(PUCCH,1) ⁽³⁾, n_(PUCCH,2) ⁽³⁾, n_(PUCCH,3) ⁽³⁾} composed of fourPUCCH resource values through one RRC signal. As described above, the UEmay determine a final PUCCH resource n_(PUCCH) ^((3,p)) to be used perantenna port according to a bit value of the ARI. According to thisexample under the above-described assumption, four PUCCH resource valuesmay be divided into two groups of group0={n_(PUCCH,0) ⁽³⁾, n_(PUCCH,1)⁽³⁾} and group 1={n_(PUCCH,2) ⁽³⁾, n_(PUCCH,3) ⁽³⁾}. In this case, thefirst bit and the last bit of the ARI may be used to indicate resourcesfor the respective groups. For example, assuming that the ARI iscomprised of b0 and b1 (where each of b0 and b1 is 1 or 0), b0 mayindicate which PUCCH resource value is used in group0 and b1 mayindicate which PUCCH resource value is used in group1. The PUCCHresource value selected in group0 may be mapped to a PUCCH resource(e.g. an OC or PRB) for antenna port p0 and the PUCCH resource valueselected in group1 may be mapped to a PUCCH resource (e.g. an OC or PRB)for antenna port p1.

The above-described method is shown in Table 23. While the case wherefour PUCCH resource values n_(PUCCH,0) ⁽³⁾, n_(PUCCH,1) ⁽³⁾, n_(PUCCH,2)⁽³⁾, and n_(PUCCH,3) ⁽³⁾ are allocated by RRC signaling is shown, thismethod may be applied to the case where more orthogonal resources areused.

TABLE 23 HARQ-ACK n_(PUCCH) ^((3,p)) Resource Indicator p = p0 p = p1(ARI) for PUCCH (e.g. antenna port 0) (e.g. antenna port 1) 00 1^(st)PUCCH resource value 3^(rd) PUCCH resource value (n_(PUCCH,0) ⁽³⁾) forAP0, (n_(PUCCH,2) ⁽³⁾) for AP1, configured by configured by higherlayers higher layers 01 1^(st) PUCCH resource value 4^(th) PUCCHresource value (n_(PUCCH,0) ⁽³⁾) for AP0, (n_(PUCCH,3) ⁽³⁾) for AP1,configured by configured by higher layers higher layers 10 2^(nd) PUCCHresource value 3^(rd) PUCCH resource value (n_(PUCCH,1) ⁽³⁾) for AP0,(n_(PUCCH,2) ⁽³⁾) for AP1, configured by configured by higher layershigher layers 11 2^(nd) PUCCH resource value 4^(th) PUCCH resource value(n_(PUCCH,1) ⁽³⁾) for AP0, (n_(PUCCH,3) ⁽³⁾) for AP1, configured byconfigured by higher layers higher layers

Table 23 shows the case where (in case of 2Tx, a total of four) signalsare received through two RRC signals per antenna and each bit of the ARIindicates a resource used for a corresponding antenna port. Table 24shows the case where {n_(PUCCH,0) ^((3,0)), n_(PUCCH,1) ^((3,1))} isallocated for antenna port p0 and {n_(PUCCH,0) ^((3,1)), n_(PUCCH,1)^((3,1))} is allocated for antenna port p1.

TABLE 24 HARQ-ACK n_(PUCCH) ^((3,p)) Resource Indicator p = p0 p = p1(ARI) for PUCCH (e.g. antenna port 0) (e.g. antenna port 1) 00 1^(st)PUCCH resource value 1^(st) PUCCH resource value (n_(PUCCH,0) ^((3,0)))for antenna (n_(PUCCH,0) ^((3,1))) for antenna port 0 (AP0), configuredport 1 (AP1), configured by higher layers by higher layers 01 1^(st)PUCCH resource value 2^(nd) PUCCH resource value (n_(PUCCH,0) ^((3,0)))for AP0, (n_(PUCCH,1) ^((3,1))) for (AP1), configured by configured byhigher layers higher layers 10 2^(nd) PUCCH resource value 1^(st) PUCCHresource value (n_(PUCCH,1) ^((3,0))) for AP0, (n_(PUCCH,0) ^((3,1)))for (AP1), configured by configured by higher layers higher layers 112^(nd) PUCCH resource value 2^(nd) PUCCH resource value (n_(PUCCH,1)^((3,0))) for AP0, (n_(PUCCH,1) ^((3,1))) for (AP1), configured byconfigured by higher layers higher layers

As another aspect of the present invention, a method of using a DownlinkAssignment Index (DAI) field in case of TDD CA will be described. A DAIis a value obtained by counting scheduled PDCCHs in a time domain and isextensible to a cell (or CC) domain in CA. In PUCCH Format 3, since theDAI value is not necessary, the DAI may be used in the presentinvention.

For example, a PUCCH Format 3 resource for a first antenna port (p=p0)may be allocated/determined using an ARI and a PUCCH format resource fora second antenna port (p=p1) may be allocated/determined using a DAI. Inpreparation for the case where PDCCHs of at least one serving cell failin detection, all of the PDCCH(s) of a serving cell may be restricted tohave the same DAI value. Meanwhile, if a PDSCH is scheduled only on aPCell, a UE may disregard a DAI value of a PCell PDCCH corresponding tothe PDSCH, fall back to a single antenna port mode, and transmit aPUCCH.

For convenience, it is assumed that the UE is assigned four orthogonalresources, for example, PUCCH resource values n_(PUCCH,0) ⁽³⁾,n_(PUCCH,1) ⁽³⁾, n_(PUCCH,2) ⁽³⁾, and n_(PUCCH,3) ⁽³⁾ through RRCsignaling in advance. Next, if it is assumed that the UE receives aPDCCH signal including ARI=[00] and DAI=[10],

-   -   n_(PUCCH,0) ^((3,0))=n_(PUCCH,0) ⁽³⁾→used for antenna port p0        (e.g. p0=0) and    -   n_(PUCCH,0) ^((3,1))=n_(PUCCH,2) ⁽³⁾→used for antenna port p1        (e.g. p1=1).

The above-described method is shown in Table 25.

TABLE 25 HARQ-ACK Resource Indi- cator (ARI) DAI value n_(PUCCH)^((3,p)) for PUCCH (used for p = p0 p = p1 (used for p = p0) p = p1)(e.g. antenna port 0) (e.g. antenna port 1) 00 01 1^(st) PUCCH resource2^(nd) PUCCH resource value (n_(PUCCH,0) ⁽³⁾) value (n_(PUCCH,1) ⁽³⁾)configured configured by higher layers by higher layers 00 10 1^(st)PUCCH resource 3^(rd) PUCCH resource value (n_(PUCCH,0) ⁽³⁾) value(n_(PUCCH,2) ⁽³⁾) configured configured by higher layers by higherlayers 00 11 1^(st) PUCCH resource 4^(th) PUCCH resource value(n_(PUCCH,0) ⁽³⁾) value (n_(PUCCH,3) ⁽³⁾) configured configured byhigher layers by higher layers 01 10 2^(nd) PUCCH resource 3^(rd) PUCCHresource value (n_(PUCCH,1) ⁽³⁾) value (n_(PUCCH,2) ⁽³⁾) configuredconfigured by higher layers by higher layers 01 11 2^(nd) PUCCH resource4^(th) PUCCH resource value (n_(PUCCH,1) ⁽³⁾) value (n_(PUCCH,3) ⁽³⁾)configured configured by higher layers by higher layers 10 11 3^(rd)PUCCH resource 4^(th) PUCCH resource value (n_(PUCCH,2) ⁽³⁾) value(n_(PUCCH,3) ⁽³⁾) configured configured by higher layers by higherlayers

In addition, the same method may be applied even if it is assumed thatthe UE is assigned 8 orthogonal resources, for example, PUCCH resourcevalues n_(PUCCH,0) ⁽³⁾, n_(PUCCH,1) ⁽³⁾, n_(PUCCH,2) ⁽³⁾, n_(PUCCH,3)⁽³⁾, n_(PUCCH,4) ⁽³⁾, n_(PUCCH,5) ⁽³⁾, n_(PUCCH,6) ⁽³⁾, and n_(PUCCH,7)⁽³⁾, through RRC signaling in advance. For example, ARI values 00, 01,10, and 11 for antenna port 0 may respectively indicate n_(PUCCH,0) ⁽³⁾,n_(PUCCH,1) ⁽³⁾, n_(PUCCH,2) ⁽³⁾, and n_(PUCCH,3) ⁽³⁾ and DAI values 00,01, 10, and 11 for antenna port 1 may respectively indicate n_(PUCCH,4)⁽³⁾, n_(PUCCH,5) ⁽³⁾, n_(PUCCH,6) ⁽³⁾, and n_(PUCCH,7) ⁽³⁾.

As another example, the UE may be assigned four orthogonal resources perantenna port through RRC signaling as follows.

-   -   n_(PUCCH,0) ^((3,0)), n_(PUCCH,1) ^((3,0)), n_(PUCCH,2)        ^((3,0)), n_(PUCCH,3) ^((3,0))→used for antenna port p0 (e.g,        p0=0)    -   n_(PUCCH,0) ^((3,1)), n_(PUCCH,1) ^((3,1)), n_(PUCCH,2)        ^((3,1)), n_(PUCCH,3) ^((3,1))→used for antenna port p1 (e.g.        p1=1)

In this case, the ARI values 00, 01, 10, and 11 may respectivelyindicate n_(PUCCH,0) ^((3,0)), n_(PUCCH,1) ^((3,0)), n_(PUCCH,2)^((3,0)), and n_(PUCCH,3) ^((3,0)) the DAI values 00, 01, 10, and 11 mayrespectively indicate n_(PUCCH,0) ^((3,1)), n_(PUCCH,1) ^((3,1)),n_(PUCCH,2) ^((3,1)), and n_(PUCCH,3) ^((3,1)).

Meanwhile, as mentioned above, when antenna (port) transmission modesaccording to respective PUCCH formats are independently configured, ifthe PUCCH formats are flexibly changed, which of antenna (port)transmission modes is to be used for transmission should be taken intoconsideration. For example, when the PUCCH transmission formats arechanged from PUCCH Format 3 to PUCCH Format 1, which of an antenna(port) transmission mode configured as PUCCH Format 3 and an antenna(port) transmission mode configured as PUCCH Format 1 is to be used fortransmission should be considered.

In addition, an application time of the antenna (port) transmission modefor the changed PUCCH format should be considered. That is, if the PUCCHtransmission formats are changed between a BS and a UE, a time when theUE applies the antenna (port) transmission mode and a time when the BSapplies the antenna (port) transmission mode may be different. Then,while the BS expects a specific antenna (port) transmission mode, the UEmay use an antenna (port) transmission mode different from the expectedmode. In this case, inequality of control information between the BS andthe UE may occur. Accordingly, it is necessary to determine an antenna(port) transmission mode in advance when the PUCCH transmission formatsare changed.

Change of the PUCCH format may indicate the case where a designatedPUCCH format is not used when a plurality of PUCCH formats is configuredso as to be used and when a PUCCH format among the plurality of PUCCHformats is used according to a corresponding situation. For example,although PUCCH Format 1a/1b is used for ACK/NACK transmission, PUCCHFormat 1 may be used for simultaneous transmission of ACK/NACK and SR.In this case, even if PUCCH is directly selected, this may be calledchange of a PUCCH format. Namely, change of a PUCCH format includesusing PUCCH formats other than a designated PUCCH format fortransmission of corresponding control information.

Hereinbelow, the case where flexible change occurs between PUCCH formatswill be explained by way of example of scenario 1 in which a PUCCHformat is changed from PUCCH Format 1a/1b to PUCCH Format 1 and scenario2 in which a PUCCH format is changed from PUCCH Format 3 to PUCCH Format1a/1b. However, the present invention is not limited thereto and it isapparent that similar methods may be applied in the case where changebetween various formats occurs.

Scenario 1 in which a PUCCH format is changed from PUCCH Format 1a/1b toPUCCH Format 1 occurs when SR transmission using PUCCH Format 1 andACK/NACK transmission using PUCCH Format 1a/1b are simultaneouslyperformed. For example, in simultaneous transmission of SR and ACK/NACK,if there is no SR, ACK/NACK may be transmitted using an ACK/NACK PUCCHresource and, in this case, an antenna (port) transmission modeconfigured as PUCCH Format 1a/1b may be used without any problem.

However, if there is SR, ACK/NACK may be transmitted using an SR PUCCHresource. If the number of ACK/NACK bits exceeds two bits, the number ofACKs is counted and preset transmission bits mapped thereto may bemodulated and transmitted using an SR PUCCH resource. At this time, evenif an antenna (port) transmission mode of PUCCH Format 1a/1b and anantenna (port) transmission mode of PUCCH Format 1 are independentlyconfigured, an antenna (port) transmission mode may be determined usingone of the following three methods.

As a first method, an antenna (port) transmission mode may use anantenna (port) transmission mode of PUCCH Format 1a/1b for ACK/NACKtransmission. For instance, in the case where PUCCH Format 1 isconfigured as an antenna (port) transmission mode of SORTD and PUCCHFormat 1a/1b is configured as a single-antenna (port) transmission mode,when SR and ACK/NACK are simultaneously transmitted, ACK/NACK may betransmitted using an SR PUCCH resource as a single-antenna transmissionmode.

As a second method, ACK/NACK may be transmitted as a predeterminedantenna (port) transmission mode regardless of an antenna (port)transmission mode of PUCCH Format 1a/1b for ACK/NACK transmission. Thepredetermined antenna (port) transmission mode may be a single-antennatransmission mode. For instance, in the case where an antenna (port)transmission mode of PUCCH Format 1 is configured as SORTD and anantenna (port) transmission mode of PUCCH Format 1a/1b is configured asSORTD, if SR and ACK/NACK is simultaneously transmitted, ACK/NACK may betransmitted using an SR PUCCH resource as a single antenna transmissionmode.

As a third method, ACK/NACK may be transmitted using an antenna (port)transmission mode of PUCCH Format 1 regardless of an antenna (port)transmission mode of PUCCH Format 1a/1b for ACK/NACK transmission. Forexample, in the case where an antenna (port) transmission mode of PUCCHFormat 1a/1b is configured as SORTD and an antenna (port) transmissionmode of PUCCH 1 is configured as a single-antenna transmission mode, ifSR and ACK/NACK is simultaneously transmitted, ACK/NACK may betransmitted using an SR PUCCH resource as a single antenna transmissionmode.

Scenario 2 in which a PUCCH format is changed from PUCCH Format 3 toPUCCH Format 1a/1b may be applied to fallback using the existing 3GPPRel-8/9 PUCCH resource and Rel-8/9 PUCCH Format 1a/1b when a PDSCH isreceived only on a PCell.

In this case, even though PUCCH Format 3 and PUCCH Format 1a/1b areindependently configured, an antenna (port) transmission mode may bedetermined using one of the following three methods.

As a first method, an antenna (port) transmission mode of PUCCH Format 3may be used for transmission. For example, in the case where an antenna(port) transmission mode of PUCCH Format 3 is configured as SORTD, if afallback situation occurs, ACK/NACK may be transmitted using PUCCHFormat 1a/1b as SORTD. A PUCCH resource for a first antenna port may bedetermined as n_(PUCCH) ^((1,0))=n_(CCE)+N_(PUCCH) ⁽¹⁾ and a PUCCHresource for a second antenna port may be determined as n_(PUCCH)^((1,0))=n_(CCE)+1+N_(PUCCH) ⁽¹⁾.

As a second method, ACK/NACK may be transmitted as a predeterminedantenna (port) transmission mode irrespective of an antenna (port)transmission mode of PUCCH Format 3. The predetermined antenna (port)transmission mode may correspond to a single-antenna port mode. Thesingle-antenna port mode using a single resource may be advantageous tosolve uncertainty. For example, in the case where an antenna (port)transmission mode of PUCCH Format 3 is configured as SORTD, if afallback situation occurs, ACK/NACK may be transmitted as a singleantenna port mode using PUCCH Format 1a/1b using a PUCCH resourceallocation rule of n_(PUCCH) ^((1,0))=n_(CCE)+N_(PUCCH) ⁽¹⁾.

As a third method, an antenna (port) transmission mode of PUCCH Format1a/1b may be used for ACK/NACK transmission. For example, in the casewhere an antenna (port) transmission mode of PUCCH Format 3 isconfigured as a single antenna port mode and an antenna (port)transmission mode of PUCCH Format 1a/1b is configured as SORTD, if afallback situation occurs, ACK/NACK may be transmitted as SORTD usingPUCCH Format 1a/1b.

In the meantime, if SR and ACK/NACK transmissions simultaneously occurin a fallback situation, a rule of scenario 1 may be applied.

FIG. 41 is a flowchart illustrating an ACK/NACK transmission method towhich the present invention is applied.

A UE may detect a PDCCH transmitted from a BS (S4000). The UE mayreceive a PDSCH based on the detected PDCCH (S4010). The UE may transmitACK/NACK corresponding to the PDSCH using a specific antenna (port)transmission mode with one of a plurality of PUCCH formats (S4020).Meanwhile, the case where PUCCH formats are changed such as the casewhere ACK/NACK and SR transmissions simultaneously occur may occur. Forexample, if ACK/NACK and SR transmissions simultaneously occur, PUCCHFormat 1a/1b for ACK/NACK transmission may be changed to PUCCH Format 1using an SR PUCCH resource for ACK/NACK transmission. The same case mayoccur when PUCCH formats are changed from PUCCH Format 3 to PUCCH Format1a/1b. As an antenna (port) transmission mode corresponding to thechanged PUCCH format, an antenna (port) transmission mode correspondingto a PUCCH format prior to change, an antenna (port) transmission modecorresponding to a PUCCH format after change, or an antenna (port)transmission mode configured separately for the changed PUCCH format maybe configured. The antenna (port) transmission mode configuredseparately for the changed PUCCH format preferably corresponds to asingle antenna port mode.

FIG. 42 illustrates a BS and a UE that are applicable to an exemplaryembodiment of the present invention. If a relay is included in awireless communication system, communication on backhaul link isperformed between the BS and the relay and communication on access linkis performed between the relay and the UE. Accordingly, the BS or the UEshown in the figure may be replaced with a relay according tocircumstance.

Referring to FIG. 42, a wireless communication system includes a BS 110and a UE 120. The BS 110 includes a processor 112, a memory 114, and aRadio Frequency (RF) unit 116. The processor 112 may be configured tocarry out the procedures and/or methods proposed in the presentinvention. The memory 114 is connected to the processor 112 and storesvarious information related to the operation of the processor 112. TheRF unit 116 is connected to the processor 112 and transmits and/orreceives RF signals. The UE 120 includes a processor 122, a memory 124,and an RF unit 126. The processor 122 may be configured to carry out theprocedures and/or methods proposed in the present invention. The memory124 is connected to the processor 122 and stores various informationrelated to the operation of the processor 122. The RF unit 126 isconnected to the processor 122 and transmits and/or receives RF signals.The BS 110 and/or the UE may have a single antenna or multiple antennas.

The embodiments of the present invention described above arecombinations of elements and features of the present invention. Theelements or features may be considered selective unless otherwisementioned. Each element or feature may be practiced without beingcombined with other elements or features. Further, an embodiment of thepresent invention may be constructed by combining parts of the elementsand/or features. Operation orders described in embodiments of thepresent invention may be rearranged. Some constructions of any oneembodiment may be included in another embodiment and may be replacedwith corresponding constructions of another embodiment. It is obvious tothose skilled in the art that claims that are not explicitly cited ineach other in the appended claims may be presented in combination as anembodiment of the present invention or included as a new claim by asubsequent amendment after the application is filed.

In the embodiments of the present invention, a description is mainlygiven, centering on a data transmission and reception relationship amonga BS and a UE. Such a data transmission and reception relationship isextended to data transmission and reception between a UE and a relay orbetween a BS and a relay in the same or similar manner. In some cases, aspecific operation described as performed by the BS may be performed byan upper node of the BS. Namely, it is apparent that, in a networkcomprised of a plurality of network nodes including a BS, variousoperations performed for communication with a UE may be performed by theBS, or network nodes other than the BS. The term ‘BS’ may be replacedwith the terms fixed station, Node B, eNode B (eNB), access point, etc.The term ‘UE’ may be replaced with the terms MS, Mobile SubscriberStation (MSS), etc. The term ‘relay’ may be replaced with the termsRelay Node (RN), relay station, repeater, etc.

The embodiments of the present invention may be achieved by variousmeans, for example, hardware, firmware, software, or a combinationthereof. In a hardware configuration, an embodiment of the presentinvention may be achieved by one or more ASICs, DSPs, DSDPs, PLDs,FPGAs, processors, controllers, microcontrollers, microprocessors, etc.

In a firmware or software configuration, an embodiment of the presentinvention may be implemented in the form of a module, a procedure, afunction, etc. Software code may be stored in a memory unit and executedby a processor. The memory unit is located at the interior or exteriorof the processor and may transmit and receive data to and from theprocessor via various known means.

The detailed description of the exemplary embodiments of the presentinvention has been given to enable those skilled in the art to implementand practice the invention. Although the invention has been describedwith reference to the exemplary embodiments, those skilled in the artwill appreciate that various modifications and variations can be made inthe present invention without departing from the spirit or scope of theinvention described in the appended claims. Accordingly, the inventionshould not be limited to the specific embodiments described herein, butshould be accorded the broadest scope consistent with the principles andnovel features disclosed herein.

INDUSTRIAL APPLICABILITY

The present invention is applicable to a UE, BS, or other devices of awireless mobile communication system. Specifically, the presentinvention is applicable to a method for transmitting uplink controlinformation and an apparatus therefor.

The invention claimed is:
 1. A method for transmitting, by a userequipment, an Acknowledgement/Negative Acknowledgement (ACK/NACK) signalin a wireless communication system, comprising: when a Physical DownlinkShared Channel (PDSCH) is received only on a primary cell and the userequipment is configured to a Physical Uplink Control Channel (PUCCH)format 3, transmitting an at least one ACK/NACK signal corresponding tothe PDSCH using a first PUCCH format, wherein the at least one ACK/NACKsignal is transmitted using an antenna port transmission mode configuredfor the first PUCCH format, and wherein the first PUCCH format is one ofa PUCCH format 1a or a PUCCH format 1b.
 2. The method of claim 1,wherein the antenna port transmission mode for the first PUCCH format isconfigured by a radio resource control signal.
 3. The method of claim 1,wherein an antenna port transmission mode for the PUCCH format 3 isconfigured independently from the first PUCCH format.
 4. The method ofclaim 1, wherein the antenna port transmission mode is a single-antennaport mode.
 5. The method of claim 1, wherein the antenna porttransmission mode is a SORTD (Spatial Orthogonal Resource TransmitDiversity).
 6. An apparatus for transmitting an Acknowledgement/NegativeAcknowledgement (ACK/NACK) signal in a wireless communication system,comprising: a Radio Frequency (RF) unit configured to receive andtransmit radio signals; and a processor configured to control the RFunit, wherein the processor is further configured to: when a PhysicalDownlink Shared Channel (PDSCH) is received only on a primary cell andthe apparatus is configured to a Physical Uplink Control Channel (PUCCH)format 3, transmit an at least one ACK/NACK signal corresponding to thePDSCH using a first PUCCH format, wherein the at least one ACK/NACKsignal is transmitted using an antenna port transmission mode configuredfor the first PUCCH format, and wherein the first PUCCH format is one ofa PUCCH format 1a or a PUCCH format 1b.
 7. The apparatus of claim 6,wherein the antenna port transmission mode for the first PUCCH format isconfigured by a radio resource control signal.
 8. The apparatus of claim6, wherein an antenna port transmission mode for the PUCCH format 3 isconfigured independently from the first PUCCH format.
 9. The apparatusof claim 6, wherein the antenna port transmission mode is asingle-antenna port mode.
 10. The apparatus of claim 1, wherein theantenna port transmission mode is a SORTD (Spatial Orthogonal ResourceTransmit Diversity).
 11. A method for transmitting, by a user equipment,an Acknowledgement/Negative Acknowledgement (ACK/NACK) signal in awireless communication system, comprising: configuring the userequipment to a Physical Uplink Control Channel (PUCCH) format 3; when aPhysical Downlink Shared Channel (PDSCH) is received only on a primarycell, transmitting an at least one ACK/NACK signal corresponding to thePDSCH using a first PUCCH format, wherein the at least one ACK/NACKsignal is transmitted using an antenna port transmission mode configuredfor the first PUCCH format, wherein the first PUCCH format is one of aPUCCH format 1a or a PUCCH format 1b, and wherein the antenna porttransmission mode is a SORTD (Spatial Orthogonal Resource TransmitDiversity).
 12. An apparatus for transmitting anAcknowledgement/Negative Acknowledgement (ACK/NACK) signal in a wirelesscommunication system, comprising: a Radio Frequency (RF) unit configuredto receive and transmit radio signals; and a processor configured tocontrol the RF unit, wherein the processor is further configured to:configure the user equipment to a Physical Uplink Control Channel(PUCCH) format 3, when a Physical Downlink Shared Channel (PDSCH) isreceived only on a primary cell, transmit an at least one ACK/NACKsignal corresponding to the PDSCH using a first PUCCH format, whereinthe at least one ACK/NACK signal is transmitted using an antenna porttransmission mode configured for the first PUCCH format, wherein thefirst PUCCH format is one of a PUCCH format 1a or a PUCCH format 1b, andwherein the antenna port transmission mode is a SORTD (SpatialOrthogonal Resource Transmit Diversity).